No snorkels. Guppy as they were called after the war when the snorkel was added.
Not sure about the radar depth question. I just submerge until the radar does not work anymore. The I go up a few feet until it works. This then is the radar depth for the particular class of submarine you are using.
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“You're painfully alive in a drugged and dying culture.”
― Richard Yates, Revolutionary Road
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