When an orchestra is playing,gentlemen wear proper evening attire,which is also more efficient survival gear . Now,the proper survival strategy for floatation is NOT to tread water. Does a cork tread water? NO,a cork bobs.You want to practice the 'Deadman's float'.This looks just like it sounds,body relaxed,head down and holding your breath.Periodically you paddle your arms downward to rise above the water to breathe. Does it work? I was the worst swimmer in Coast Guard basic training ( excluding the 5 that couldn't swim at all). I also held the record for survival floating; 7 hours and 20 minutes in the deep end. As for "Things that go bump in the night." Most shark attacks occur immediately following a crash or wreck. the DISTURBANCE is what attracts these animals. Water survival is much like Judo. Flow with the forces working against your survival. They are ALL bigger than you are.<br><br>