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This officer stayed aboard the submarine and was not involved in the apprehension of the Ark or Marion Ravenwood, leaving that task to ColonelDietrich and René Belloq. As Belloq came back aboard with Ravenwood, the officer came down the ladder and got the navigator's attention, from his maps. As the ship was readied for underwater travel, he relayed orders from the captain to the crew to dive.
Taller than his captain, he had to hunch down to peer through the periscope as they neared Geheimhaven.
When the U-boat docked inside the secret island base, he stood on the ship's conning tower, watching Dietrich and Belloq depart.