The SkyDivers are four S.H.A.D.O. submarines designed and built to operate underwater for extended periods; in the event of a UFO attack, the Sky One aerial interceptors can be launched from them at brief notice.
- Length: 120 feet
- Top speed (surfaced): 15 knots
- Top speed (seaskim mode): 25 knots
- Top speed (submerged): 40 knots
- Maximum operating depth: 620 fathoms (3,720 feet)
- Danger depth: 900 fathoms (5,400 feet)
- Crew: 5-6