The door is facing the pool - you can see the windows of the cellar outlined in the white square at the base of the tower.....
Inside the cellar - at the far end, is a hole in the wall - and this leads to the 'crawl space' - which is absolutely full..... of bats.
As a defence mechanism, that bat droppings are lethal - and this prevents cobras and other large snakes - which would be quite able to reach up and snack on a snoozing bat, from coming into the room.
Folk going to the pool would have smelled a slight hint of amonia - and possibly assumed it was pool chemicals - but it is in fact the bat droppings.
And.....there are a few bats in there.......
A great thing to do - especially with children, is to try and run to the far end of the room through the droppings, shouting and waving your hands in the air! The feel of frantic bat trying to get out of your hair is something that should be experienced by everybody at least once!
Even taking the photos - I had one fly into my face. Cool!