Why this word is great
BATHYSPHERE — [Noun] A spherical steel deep-diving chamber with perspex windows, lowered by cable to study the oceans and deep-sea life. From Greek βαθύς (bathys, "deep") + -sphere ("sphere"), coined in the 1930s for a specific device. Unlike "bathyscaphe" (a free-diving, self-propelled craft) or "submersible" (a generic term for underwater vessels), the bathysphere is a steel cocoon, suspended by a thread, utterly dependent on the surface world. It is the creak of cable under tension, the condensation beading on cold metal, the eerie blue glow beyond the porthole fading to black—a fragile bubble of air and light in a realm that tolerates neither.