Argumento
A puny guy has volunteered to train as a frogman (USN UDT, precursors to USN SEALs), but is immediately nicknamed "Sardine" by guys called "Shark" and "Whale". He recalls being bullied and coddled as a kid, but looks as if he'll wash out. Then, as the team trains at raft-righting, a shark comes gunning for his teammates, and "Sardine" dives in the way!