[Is he gone? David holds his breath, waiting to see if the scratching resumes. He can't see under his door, so no peeking for him. Hesitantly, he starts to crawl out of the corner.

He's communicator's still on the floor. Maybe he can use it. Make a post of his own. Call for help, maybe. Someone who can get him out of here. He can't well stay in this room for however long the flood lasts.]