Oxygen Destroyer

The Oxygen Destroyer is a super-weapon, created by Daisuke Serizawa, that debuted in the 1954 film, Godzilla (1954 film).

Overview
The weapon has a metallic, capsule-like design with a glass-tube surrounding the sphere-like object. In which it opens vertically. When it is submerged in water, the sphere, in the center, opens and releases the chemical compound. Bubbles start forming and anything that is caught around the proximity is either liquefied or reduced to bones.

Trivia

 * This is first weapon capable of killing the original Godzilla.