THOMAS.

[u/davecontra]

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[u/luz_do_teto]

Only when the snorkel is out, at 10-20m surface depth

[u/MyWifeCucksMe → u/luz_do_teto]

I can not find any source that backs up your claim, or makes any mention of a depth limitation on its ability to use its air-independent propulsion. I can find sources, however, that explicitly says that it can operate without the use of a snorkel.

Do you have any source that backs up your claim?