The vessel will be constructed primarily of galvanized steel plate.
the dimensions of the vessel are 100 feet long by 50 feet wide by 100 feet deep.
When submerged, the vessel will be 95% + filled with water (Allowing the vessel to float). depending on the required thickness and resulting weight of the steel, only a few feet of the vessel will extend out of the water.
I will explain more of the internal design during our initial chat.