When I was attending SUNY Maritime, the Throggs Neck bridge the campus resided under had a maintenance worker fall from it into the drink in 2012. Even with the USCG on site immediately (their academy was on the opposite side of the Long Island Sound), the currents toke that dude and he was presumed dead. A lot of people don't understand that operating on the water is a lot like operating in outer space--albeit with oxygen present so long as you're not a submariner. The environment is constantly trying to kill you and it's up to human engineering and protocols to prevent the environment from killing you via hypothermia, dehydration, or spatial drift, etc.