ASTOR, was a submarine-launched wire-guided nuclear torpedo designed by the United States Navy for use against high-speed, deep-diving, enemy submarines.

This electrically propelled, 19-inch (483 mm) diameter torpedo was 225 or 227 inches (5.72 or 5.77 m) long, with an approximate mass of 2,300 pounds (1,000 kg).

[9] The requirement for positive control of nuclear warheads meant that ASTOR could only be detonated by a deliberate signal from the firing submarine, which necessitated a wire link.

[10] In reality, this was an exaggeration, because the Mark 90 Betty nuclear depth charge, with a much greater yield of 32 kilotons, was estimated as having a submarine kill radius of approximately 1.3 nautical miles (2 km) around the epicenter, much less than the maximal range of the ASTOR guidance wire.

The weapon had been fitted with a conventional warhead and acoustic guidance, including wake homing, marketed as the Mark 45 Freedom torpedo.

[4] The USS Scorpion, a Skipjack class submarine which was lost with all hands in 1968, contained two Mark 45 ASTOR torpedoes.