How does moisture affect the cargo hold compartment of a Boeing 777?

You could even talk generally, but any answer specifically to B777 would be greatly appreciated.How does moisture affect the cargo hold compartment of a Boeing 777?
The same air is used to pressurize and heat/cool the cargo hold as the passenger compartment, so it isn't an issue.How does moisture affect the cargo hold compartment of a Boeing 777?
There are sump drains in the bilge. When the airplane is pressurized, they are closed; when pressure equalizes, they are spring loaded to allow water to drain out.