Rygel: We're in mud! Under the mud!
Aeryn: You're Hynerian. You're aquatic, what's your problem?
Rygel: Aquatic, that's water, not mud! Mud is... mud! You can't breathe in it, you can't move in it. It holds you, it grabs you, it sucks you down! You wanna know about mud? I know about mud!
Crichton: The guy knows mud.