"A city under the water?" He's just asking for confirmation. After falling in through the TV, there isn't much that can surprise Souji. That would be kind of awesome to see though.

But later. Right now, he has to ask. "Well, everything if it's possible." Wait, he should be more specific.

"...The last thing I remember before waking up on the ship was coming back from the hospital," Souji says slowly. They just rescued Nanako from Namatame and doctors said she's stable but- "Are we really stranded here?" People told him they are but, somehow, he won't believe it until he hears it from someone he knows. "And is there anyone else here?"