The Five Person Exploration Submarine [$2,700,000] is where  Jacques Cousteau meets James Bond. This submersible craft allows you and four of your closest friends to cruise around and explore the ocean depths in both comfort and high-tech style. It has 2 horizontal thrusters for fore, aft, and directional control and 2 vertical thrusters to provide up and down control. you and your buds can cruise around at 2.5 knots submersed and 4 knots on the surface. So if you are  like my buddy Ringo, you want to be under the sea, in an octopuses garden, then sell all the rights to the Beatles song collection and buy one of these.

Buy: Hammacher Schlemmer