Is that a sump pump hole in the floor of the gun room? If so, I'd be nervous about excess humidity, though it looks like you also have a dehumidifier there.
You might attempt to minimize evaporation of water from the sump by putting a loose cover over the hole. It might minimize evaporation while allowing the sump to "breathe" when the pump operates.
People are like rifles. Some are tried and true, having great eyes, personality, and fun to be with. Others never seem to hit the mark with you. Still others go off half-cocked. Still, it's nice to know most of them.