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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Answers by country

to take fresh air into the boats
to neutralize odors
ventilation of a submerged ship
wastewater disposal
answers
flagAustralia
80%
0%
20%
0%
10
flagthe Netherlands
73%
5%
15%
5%
19
flagGermany
48%
3%
26%
20%
60
flagPoland
47%
7%
24%
19%
2697
flagthe United Kingdom
42%
2%
40%
11%
35
flagthe United States
40%
8%
26%
26%
50
flagGreece
33%
8%
41%
16%
12
flagCanada
30%
7%
30%
30%
13
flagRepublic of Ireland
25%
12%
37%
25%
16
flagEgypt
18%
9%
9%
63%
11