Havent you always dreamed of owning your own submarine? A true hobbyist can build his own budget C-Questor submarine for around $75,000. This man is building a 4-man sub for treasure hunting. If you have $78m to spare and want a top-of-the-range luxury model, fully air-conditioned with luxurious wood-panelling thoughout, you will find the ultimate subs at US Submarines.