Playing this again because of course I am. Just dispatched these two cretins and found myself wondering... how the hell did they get there??

We happen upon them whilst exploring the ship here...

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However, when we arrived at the Gelnika, there was no other submarine or vehicle in sight?

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They were not wearing any kind of scuba gear. They were just in usual black-suited Turk garb.

Please can someone who is knowledgeable in the extended universe answer me this?