bathysphere

/ˈbæθɪˌsfɪə(ɹ)/

IPA: /B AE1 TH IH0 S F IH0 R/

noun
  1. 1

    A spherical steel deep-diving chamber with perspex windows, in which persons are lowered to the depths by a cable to study the oceans and deep-sea life; the precursor to the bathyscaphe

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Source: https://en.wiktionary.org/wiki/bathysphere