It's called a Davit

I see A LOT of people saying how they would love to see the inside of these wrecks. I'd just like to warn everyone. This is a Pretty Dangerous Place, the wrecks are extremely unstable. Many young people have been injured here.

I live across the Arthur Kill From this Site, And have even purchased parts from the owner, for my boat. The "cylindrical things" along the long access of the hull are called "Bubbles" and are there as a type of Fender Protection. They also add longitudinal reinforcement to the hull as an added bonus.