No one immediately responds, and it takes a great deal more effort not to panic than it should. He's been alone before, but the thought of being alone in the middle of space? God, it's fucking terrifying. Thankfully he doesn't have to wait long as a message flashes across the screen.

hello is someone there

Relief floods his veins and he lets out a whoop of victory that in no way could have been a sob if this hadn't worked out. Honest.

hello! I'm here! Where are you?

He waits eagerly for a response, his arms crossed defensively in front of himself, his leg bouncing with nervous energy. Carl doesn't care who it is, just that he's not completely alone. Then they can figure out how to fix whatever is happening.