Hi
This is a small quarry close to my home. It is around 40 meters deep at the deepest point.
The water is very blue and clear which is why it is used as a swimming place in the summer as you can see from the blurred swimmers. There is also a sunken boat at the bottom of this place which is a popular diving place. There are even divers in the winter who drill a hole into the ice and go see the boat.
Pictures were taken on my DJI Phantom 4 Advanced.
This is a picture I took in the quarry with my brand new phone 2 years ago. Fun fact: The brand new phone wasn't waterproof as marketed and I lost my 350€ phone after having it for 6 hours.