Secret Lair with Spiders

Was living/staying in a house that was previously owned by a guy who shot his wife after finding out she had a secret lair beneath it. People were saying it was a torture chamber bit it was more like a mad scientist lab. You entered it by pulling a rope near the house that opened up a door in a tree at the front of the yard. There were stairs going downward but more like a slide, and spiders/spider webs all over the top. Once you got down there it opened up into these weird rooms. Everything was very lab-ish kind of like a locker room. There were showers, a bedroom area with 8 beds (clothes set out on them) and then this room in the back that was a HUGE pool but resembled a dunking tank. The odd thing was that all the drains were plugged- Christine and I were trying to make the water go down but couldn't. It was clear at first but then turned muddy and gross. The place was in Alabama near a highway, when we left it was by a back entrance and then we were walking near the freeway to get back to the house.