If you find yourself tied and thrown under water, retired SEAL Clint Emerson has some tips to survive. Emerson is the author of 100 Deadly Skills. (Daniel Woolfolk and Alan Lessig/Staff)

If you find yourself tied and thrown under water, retired SEAL Clint Emerson has some tips to survive. Emerson is the author of 100 Deadly Skills. (Daniel Woolfolk and Alan Lessig/Staff)