With the mysterious ocean depths remaining as one of man's last unexplored frontiers, new research vessels are being developed. The Navy's Alvin is one of these & it makes a maiden dive 6,000 feet down off the coast of the Bahamas. TLS/MS - U.S. Navy Alvin submarine on deck of boat. TLS - USN Alvin submersible being lowered, submerged into ocean water. Underwater shots of Alvin maneuvering.