The image on the left is a view of the Engine Compartment on HMCS Ojibwa looking aft. The image on the right is the space between the engine on the right side of the image on the left and the pressure hull wall. When the boat heeled, submariners working in this space would be pinned to the pressure hull wall because the engines are not bolted to the deck. The white tubing down the left side of the image is part of the modern heating/cooling system. One benefit of working in that space was the fact you were definitely out of sight!