Nice one - Thanks again!!

I removed the stupidly complex airlock and switched it with a more vanilla design. But I may use that complex airlock in future submarines.

Thanks for the comment! I'll look into it once I get the chance to.

This is my fav sub as of now. two things ive noticed, if the air lock is flooded it makes the whole sub sink. if the bottom air lock door is damaged, the only way to fix it is to cut or force the other door open. bots wont use a cutter or crowbar so requires manual intervention. All very minor things :) . Keep up the good work.