BORSTAR divers training in Panama City, Fla.
A U.S. Border Patrol agent glides over a submerged log at roughly 40 feet as he enters the mouth of an subterranean spring as he and fellow members of the elite BORSTAR dive team conduct training in the use of dry suits at Morrison Springs near Panama City, Fla., May 23, 2016. CBP Photo by Glenn Fawcett. Original public domain image from Flickr