You were on a mission but ended up getting split from the group. As you were making your way through one of the buildings you got locked in one of the rooms, that slowly started filling with water.

It had now turned into a suicide mission

As you waited for them to find your location you started talking to Soap through your radio. “In another universe?” You asked softly. “No, don’t say that.. we’ll find you.. I promise.” Soap replies.