A Mark IV Amphibian is an early model of British naval oxygen rebreather made by Siebe Gorman. It was arranged like a UBA, but its oxygen cylinder is smaller. It was so called because it could be used for diving, or as an industrial breathing set on land.
The Mark IV Amphibian is sometimes called the 'I'm an Octopus' Suit, due to the popular saying "I'm an Octopus and I like Divers". The Mark IV Amphibian is also currently being reproduced in a factory in Hong Kong called Walsh's facilities (English Translation) where they are being distributed to museums around Europe.
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“There mark what ills the scholar’s life assail,
Toil, envy, want, the patron, and the gaol.”
—Samuel Johnson (1709–1784)