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submarine zmanim

Question:
if one would be on a submarine and needed to daven would the din be the same as if he was flying in a plane and the zman is based on hwere he is or it goes based on the port time which is how they keep time on the boat.

Answer:

The zmanim would be based on his current location, as all zmanim in halacha, and not the time at the port from which they left. This would seem to be the zmanim at the surface where the submarine is located.

see the sources here for a similar discussion with regards to northern lands that don’t have a regular daily cycle:

//en.tvunah.org/2017/05/22/st-petersberg-white-night-zmanim/

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