Underwater body having a variable volume and method for operating such an underwater body

An underwater body comprising:

• a shell,
• a movable component,
• an expansion means, and
• a hollow space,
• wherein the movable component is movable relative to the shell from a retracted position into an extended position and is operatively connected to the hollow space,
• wherein the underwater body with the movable component in the extended position has a greater volume compared to the underwater body with the movable component in the retracted position, and
• wherein the expansion means is configured to conduct a fluid into the hollow space and, as a result, of moving the movable component into the extended position,
• wherein the underwater body is configured such that when the fluid in the hollow space hardens the hardened fluid holds the movable component in the hollow space in the extended position.

A method for operating an underwater body wherein the underwater body includes:

• a shell,
• a movable component,
• an expansion means, and
• a hollow space,
• wherein the movable component is movable relative to the shell from a retracted position into an extended position and is operatively connected to the hollow space,
• wherein the method comprises:
• conducting, via the expansion means, a fluid into the hollow space,
• moving the movable component from the retracted position into the extended position as a result of the conducting of the fluid, and
• increasing the underwater body in volume,
• hardening the fluid in the hollow space, and
• holding, with the hardened fluid, the movable component in the extended position in the hollow space.