Despite being a team of aviators, the Blackhawk Squadron has employed a number of submarines in their adventures.
The Blackhawks first built an atomic submarine called the Hawkmarine to battle Sea Wolf, a female villain in command of a submarine wolfpack, who was responsible for sinking US arms shipments to Europe in the North Atlantic. Later, the submarine's name was changed to Hawksub (or Hawk-sub). The Hawksub was used frequently by the Blackhawks to battle seafaring villains such as Killer Shark.
In the mid-1950s, the Blackhawks designed another atomic submarine, built by the U.S. Navy, named Sea Hawk that could descend to a depth of 1500 feet. The Soviet military obtained blueprints of the submarine and built a copy immediately. At the end of Sea Hawk's first cruise, the original Sea Hawk was sunk and the Blackhawks captured the Russian prototype. However the plans were compromised, and the USSR produced more copies of this remarkable warship.
- The Hawkmarine was built by the Blackhawks, at an isolated shipyard in England. It had an atomic power plant, and a triple-thick hull.
- The Hawkmarine could be safely submerged or surfaced from the Blackhawks' belt radios.
- The Hawksub's first appearance in Blackhawk #87 (April 1955) took place in the Quality Universe.
- The Hawksub's destruction in Blackhawk #145 (Feb 1960) took place in the Earth-One Universe.
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