plunge line JUST WRITTEN FOR YOU
/ˈplʌndʒ laɪn/ · plunge.line
noun
- A guideline or reference point used to measure the depth of water or to indicate the position of an underwater object. The diver used the plunge line to gauge the depth of the ocean floor.
- A line or thread used to guide a diver or a submarine into a body of water. The plunge line was attached to the submarine's hull to ensure a safe descent into the depths of the sea.
Did you know? The plunge line has been used in various forms of underwater exploration, including deep-sea diving and oceanographic research.