Daimon didn't wake the girls up due to the previous information provided by Rita, to be honest he didn't care to stay in this hill till today's night, where the Trident Marshal would finally realize there was something off.
He didn't have a positive impression of most of the other participants after all, the only exceptions being those guys with whom he travelled back in the caravan and according to Rita they weren't in this underwater space, so he didn't have to worry about anything.
As long as the girls around him remained safe he couldn't care less about both the nobles or the members of the Elemental Sea, on the other hand he needed to hunt some magic beasts as his mission required him to do so.
Luckily for him, there were magic beasts running wild wight now, who weren't under the control of the pirates or the Skelefiends, so that was a cake which fell from the heavens right at his table.