Dianna Nyad once tried to swim 103 miles from Havana, Cuba to Key West, Fl. when she was 28 years old, only to be pulled out around hour 40 of the 60 hour trek. Now, at age 61, she is again attempting the swim. If successful, she will become the first to do so without a shark cage—which, if you watched Shark Week, is the scariest part of this project …