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Scavenger hunts head underwater

  • In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins carries a float with a "Diver Down" flag as he prepares to place a geocache in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. (AP Photo/Wilfredo Lee)
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    In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins carries a float with a "Diver Down" flag as he prepares to place a geocache in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. (AP Photo/Wilfredo Lee)

    In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins carries a float with a "Diver Down" flag as he prepares to place a geocache in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. (AP Photo/Wilfredo Lee)
  • In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins hooks a line to a float with a "Diver Down" flag as he prepares to place a geocache in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. (AP Photo/Wilfredo Lee)
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    In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins hooks a line to a float with a "Diver Down" flag as he prepares to place a geocache in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. (AP Photo/Wilfredo Lee)

    In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins hooks a line to a float with a "Diver Down" flag as he prepares to place a geocache in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. (AP Photo/Wilfredo Lee)
  • In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins places a weight and geocache marker in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. (AP Photo/Wilfredo Lee)
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    In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins places a weight and geocache marker in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. (AP Photo/Wilfredo Lee)

    In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins places a weight and geocache marker in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. (AP Photo/Wilfredo Lee)
  • In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins demonstrates how a tube, weighed down by a concrete block, will mark the site of a geocache he will place in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. (AP Photo/Wilfredo Lee)
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    In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins demonstrates how a tube, weighed down by a concrete block, will mark the site of a geocache he will place in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. (AP Photo/Wilfredo Lee)

    In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins demonstrates how a tube, weighed down by a concrete block, will mark the site of a geocache he will place in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. (AP Photo/Wilfredo Lee)
  • In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins uses a lift bag to place a weight and geocache marker in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. Scuba or underwater geocaching follows the same rules as the terrestrial-based game, but includes some challenges. Land-based geocaching relies largely on GPS coordinates. With underwater geocaching, visual clues are added because it’s difficult to give an exact GPS location on the water. The cache must also be submersible and must withstand water pressure and corrosion; logbooks are waterproof. (AP Photo/Wilfredo Lee)
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    In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins uses a lift bag to place a weight and geocache marker in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. Scuba or underwater geocaching follows the same rules as the terrestrial-based game, but includes some challenges. Land-based geocaching relies largely on GPS coordinates. With underwater geocaching, visual clues are added because it’s difficult to give an exact GPS location on the water. The cache must also be submersible and must withstand water pressure and corrosion; logbooks are waterproof. (AP Photo/Wilfredo Lee)

    In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins uses a lift bag to place a weight and geocache marker in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. Scuba or underwater geocaching follows the same rules as the terrestrial-based game, but includes some challenges. Land-based geocaching relies largely on GPS coordinates. With underwater geocaching, visual clues are added because it’s difficult to give an exact GPS location on the water. The cache must also be submersible and must withstand water pressure and corrosion; logbooks are waterproof. (AP Photo/Wilfredo Lee)
  • In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins uses a lift bag to help him carry a weight and geocache marker to place it in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. (AP Photo/Wilfredo Lee)
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    In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins uses a lift bag to help him carry a weight and geocache marker to place it in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. (AP Photo/Wilfredo Lee)

    In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins uses a lift bag to help him carry a weight and geocache marker to place it in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. (AP Photo/Wilfredo Lee)
In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins carries a float with a "Diver Down" flag as he prepares to place a geocache in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. (AP Photo/Wilfredo Lee)
In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins hooks a line to a float with a "Diver Down" flag as he prepares to place a geocache in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. (AP Photo/Wilfredo Lee)
In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins places a weight and geocache marker in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. (AP Photo/Wilfredo Lee)
In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins demonstrates how a tube, weighed down by a concrete block, will mark the site of a geocache he will place in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. (AP Photo/Wilfredo Lee)
In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins uses a lift bag to place a weight and geocache marker in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. Scuba or underwater geocaching follows the same rules as the terrestrial-based game, but includes some challenges. Land-based geocaching relies largely on GPS coordinates. With underwater geocaching, visual clues are added because it’s difficult to give an exact GPS location on the water. The cache must also be submersible and must withstand water pressure and corrosion; logbooks are waterproof. (AP Photo/Wilfredo Lee)
In this Saturday, Jan. 14, 2012 photo, Kenny Jenkins uses a lift bag to help him carry a weight and geocache marker to place it in about 33 ft. of water in Lake Denton in Avon Park Fla. Interest in geocaching has grown significantly over the years. But combining the two hobbies, geocaching and scuba diving, has only recently taken off. About 100 geocaches around the world today are only accessible with scuba gear, according to the geocaching.com database. (AP Photo/Wilfredo Lee)

Geocaching is a hunt for a hidden "geocache," a container with a logbook, with the aid of GPS. Scuba or underwater geocaching follows the same rules as the terrestrial-based game, but includes some challenges. With underwater geocaching, visual clues are added because it's difficult to give an exact GPS location on the water. The cache must also be submersible and must withstand water pressure and corrosion; logbooks are waterproof.