I always see ships that seem to be shooting water from the hull, why do they do this?
Is it water sucked in by the engine for cooling purposes which is then pumped back overboard?
https://i.redd.it/ip5h2hn9qq791.jpg
In: 4419
Larger ships have [ballast](https://en.wikipedia.org/wiki/Ballast) systems to maintain stability, mostly using water in [ballast tanks](https://en.wikipedia.org/wiki/Ballast_tank).
The water in ballast tanks must be constantly managed to provide hydrostatic stability. They basically pump water into (and out from) the ship, and between various ballast tanks inside the ship.
https://www.marineinsight.com/naval-architecture/a-guide-to-ballast-tanks-on-ships/
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