What are a schnorchel used in submarines for?

to take fresh air into the boats
to neutralize odors
ventilation of a submerged ship
wastewater disposal
A submarine snorkel is a device which allows a submarine to operate submerged while still taking in air from above the surface. British Royal Navy personnel often refer to it as the snort. A concept devised by Dutch engineers, it was widely used on German U-boats during the last year of World War II and known to them as a schnorchel.
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to take fresh air into the boats
to neutralize odors
ventilation of a submerged ship
wastewater disposal
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