It depends on how motivated they are to get off a sinking sub.
" Guinness Book of World Records Most People Crammed into Old-Style Volkswagen Beetle (Bug)"
17
BTW, I've been in a Toyota pickup with 28 people (Kenya) and seen them with 35.
[This one is a Peugeot]
Thats nothing a half ton pickup ran into a river around here had 10 people in the cab and 30 people in the back ya know some of our friends south of the boarder anyway the 10 in the cab got out safely the 30 in back drowned..... they couldn’t get the tailgate open!!! /SS