Really cool idea! This inspired me to look up what Iron Lung was, because I'd never heard of it. I love the old 90's Doom aesthetic of this game, and I really appreciated that there was an overlay when you hovered over something that told you what to do. The controls were so smooth and responsive! I thought the precision of the submarine was very impressive too. I did wish that the steering wheel and viewport were closer together, because I felt like I needed to fully stop to look out the window when I came close to an obstacle. I think the compass would also benefit from some kind of directional marking. Great work on this!