Hydro-Base is a floating seacraft disguised as a natural island floating off the coast of North America outside US territorial waters. It is the current replacement of the Helicarrier, which was destroyed during the Secret Invasion.


When he was captured by Captain America, Red Skull was imprisoned in the Hydro-Base while Doc Samson and Falcon were placed there to have the mind-control on them undone. Shortly after, a Sleeper attacked the Hydro-Base in order to free Red Skull.

Some time later, Captain America infiltrates the Hydro-Base in a plot to get Bruce Banner out of his cell where he and Wasp (who stowed away on Captain America upon having second thoughts about Red Hulk) discovers that a device had been put on the back of Bruce Banner's head. After Captain America and Wasp remove the device from Hulk, the Avengers and Red Hulk arrive to arrest Captain America for "aiding a dangerous criminal." This leads to a fight between Hulk and Red Hulk where Captain America tells Iron Man of the device (which was Stark-based tech that Tony Stark sold to the military). As Hulk and Red Hulk fight throughout the Hydro-Base, Captain America discover the trigger to device on Hulk's head which was dropped by Red Hulk. After Red Hulk was defeated and regressed back to Thunderbolt Ross upon an Avengers ID card trap done by Iron Man, Thunderbolt Ross was incarcerated at the Hydro-base.

Kang the Conqueror is shown to have been transferred to the Hydro-Base until the Dynasty of Kangs spring him out of the Hydro-Base. Later, members of the Kree Stealth Ops invade the Hydro-Base in order to spring Ronan the Accuser from the Hydro-Base's prisons.


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