Yes, it was that small. They had 8 men in there. 5 died the first time it sank. 8 died, including its inventor, the second time it sank. The third time the crew died after sinking the Housatonic. They found them all in their positions, so there was no panic. One of the mysteries is if she sank, or if she was waiting on the bottom for the mayhem to settle down a bit and they all fell asleep from oxygen deprivation and suffocated.
I also made it to Magnolia Cemetery, where all three crews are interred, right after we left the WLCC.