Hide in the bathroom of the church

You hide in the bathroom of the church. You are full of adrenaline when you secure the door behind you.
The space is unexpectedly clean and nice, an incredible contrast with the dark corridors outside.

There is a big pool with marble floors and green statues, carved in stone or a similar material.
You find a golden ring on the floor. Also, you trigger a secret door, and it opens, revealing a stinky dark room, but the water in the pool is banished!

The air is full of steam, but you listen to some steps, a nun is coming!!

You don't have time to think! you can just run into the unknown corridors passing the bathroom, you can enter the dark room, and hide, or you can use the ring, hoping that it makes you invisible (it worked in a movie, so... why not?)