Letter | Published:

A man-made hot spring on the ocean floor


An instrument package emplaced in a deep-sea drill hole for the Glomar Challenger measured a rise in temperature at the bottom of the hole from 78°C shortly after drilling to 150°C after 42 days. The increase, not predicted by temperature measurements made before and during the drilling, is probably the result of hot water rising from below and flowing out of the hole into the ocean. We describe here this first recorded man-made hot spring on the ocean floor.

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