bathysphere

詳細解釋：

bath.y.sphere

n.（名詞）
A reinforced spherical deep-diving chamber in which persons are lowered by a cable to study the oceans. The bathysphere, limited to depths of about 900 meters (3,000 feet), has been supplanted by the safer and more navigable bathyscaph.
海潛球：一種堅固的球形深海潛水器，用纜繩把載人的球形艙降低以觀測海洋。潛水深度限制在900米，現已被更安全、更能航行的深海潛測艇所代替