An Atlantean member of the New Reichsmen from Earth-10.
Underwaterman was created by Grant Morrison and Jim Lee. His first full appearance was in The Multiversity: Mastermen #1.
Final Crisis: Secret Files
Underwaterman is first mentioned in this issue, as part of the Secret Files Sketchbook.
The Multiversity: Mastermen
Underwaterman is seen as part of the Nerw Reichsmen, the Nazi Justice League analogue of Earth-10. It's revealed that Underwaterman is an Atlantean and that his people fought against the Nazis during the war, destroying many of their U-Boats, before finaly joining them. The SS believed Atlanteans to be the root of the Aryan race.
His fate after the destruction of the Eagle's Nest, the satelite headquarters of the New Reichsmen, remains unknown.
Powers & Abilities
Not all of Underwaterman's powers have been revealed, but some mostly resemble Aquaman's powers.
Underwaterman has twice survived point blank explosions from the Human Bomb.
He can function normally underwater and is able to withstand the high pressures and extreme temperatures of the deep. He can also function on land normally.
He is long lived, and has been around since the war.
He has long experience at war and participated in attacks against German U-Boats. He has also been a member of the team that defeated this universe's versions of Starro and Kanjar Ro.
Weapons and Equipment
Armored Atlantean Suit
He wears a more heavily armored version of Aquaman's distinct orange scale mail shirt. The gloves are metalic, made from an unknwn material.