The Beaver Mark IV, designed and built by North American Rockwell, was special because it could dive to 2,000 feet and could mate with underwater oil capsules and other submarines. In 1969, the Beaver IV was one of the submersibles to meet at the first and only assemblage of seven deep submersibles at one time, in one location. Carrying a crew of 2 and 3 divers the Beaver had a top speed of 5 knots, a range of 20-25 nautical miles and could support life for 36 hours.

• Type: Deep Sea Submersible
• Length: 24 ft
• Payload: 2,000 lbs
• Beam: 10 ft
• Launched: September 1968