Dip into under-water prison

Once upon a time there was a prison. It was in 1938 that Murru prison was established together with a limestone quarry. There were 400 prisoners who worked there. The prison remained in operation during the Soviet times and closed only in 1991 when Estonia gained independence.
In order to keep the ground water out of the quarry there were water pumps working day in and day out.
When the quarry closed then so did the water pumps. Before anybody noticed the water had flooded the area. It happened so fast that not only all the buildings remained under water but also most of the appliances, among other things an excavator. Today all this forms a curious under-water museum, a lake with transparent water called the blue lagoon and the nearby hill of limestone sand.
You may explore it on a paddleboard or a surf. Snorkeling above coral reefs has become very common these days so why not try it out over this curious and unique sight, today already part of Estonian heritage.