Debris on the bottom. Above you can see a tin ingot that fell off of I-52 on the descent to the bottom. They had been stacked on top of the pressure hull. During the descent there was a huge explosion that tore off part of the torpedo room. This caused probably caused some of the 100 pound ingots to be displaced and fall off of the submarine..

Tin Ingot

 

Part of the antenna mechanism that keep the communication cable in the air while the submarine is on the surface.

OPERATION RISING SUN

Retracted Periscopes

I-52 is shown twice on both sides of the conning tower.