There have been discussions about building a tourist submarine, but no company has been willing to invest the money to build one. The majority of people would not want to spend their vacation in a completely sealed environment. The thinking is that the vactioner would want to see outside, which would mean portholes and other viewing ports, which would become technologically impossible even if it were economically feasable. Also, submarines tend to be very crowded places. The sailors who are aboard most warships are allocated significantly less space than the US Court's mandate for prisoners. How many vacationers would want to stay in their six foot by six foot first class stateroom and how many would be willing to share a fold out bunk with another passenger (many submarines work on the principle of "hot bunking" which means that the bed that you get out of will be used by someone else as soon as you get out of the bunk. The sheets never have a chance to get cold). Also, the operation of a submarine is an incredibly expensive proposition. The cost of a cruise on a sub for a single pasenger would probably be 50 times the cost of a cruise on an average cruise ship. If you are interested in this type of thing, there is an underwater hotel off the coast of Florida. That's about as close as you are going to get unless you volunteer for the Navy.

Nothing to see. You might as well sit in a cardboard box in your living room...with the lid closed...and put up with your own body odour after a couple of weeks...and you might get the idea. Windows are no good because they become a weakness in the structure.