Why Armor Does Not Act Like an Anchor
A suit of armor feels heavy on land because the wearer must support all of its weight. In water, the balance changes: anything that displaces water gets an upward push called buoyancy. Armor takes up space, so the water pushes back against it. The metal still weighs something, but its full dry-land weight no longer bears down on the swimmer.
The wearer’s body contributes buoyancy too. Together, body and armor can stay at the surface if they displace enough water for their combined weight. Armor is not a sealed shell, though; water flows through its openings, so it does not trap a big air pocket that would make it float like a life jacket.
Swimming Is Possible, Not Easy
Being able to stay afloat is different from moving well. Armor restricts movement, adds drag, and makes each stroke more demanding. A swimmer also has to manage the suit’s weight and balance while keeping the face above water. The result depends on the armor, the wearer, and their ability—not on a rule that every armored person will either float or sink.
Diving is possible for the same reason a swimmer can choose to go below the surface: the armor’s added weight can help overcome the upward buoyant force. But once underwater, the wearer must still control movement and return to the surface. Armor changes the effort and the balance; it does not automatically decide whether someone can swim.
