More than 250 manned submersibles have been built worldwide since the late 1950s. They have ranged from the U.S. Navy's Bathyscaph Trieste of 1958 to modern 48-passenger tourist submarines, which have carried more than 6,000,000 people since they first went into service in 1985.
Most of this world fleet of submersibles has been employed for military, scientific, and commercial purposes. Basically, these were working machines; very few were developed for recreational users. Now there is a new leisure submersible developed by a group of California aerospace engineers. This is the "SEAmobile" which I recently test-piloted at Catalina Island, California.