you should enter the water north of the bridge. Do not dive at the exit area of the river basin!
The river basin is approx. 100m long and is very popular for photographers. The bridge forms a very nice background. This place attracts many tourists, therefore you will be never alone there.
Don't dive without an experienced guide or proper training in the rivers. There are some dangers and risks you should know about. Also you should have proper security equipment with you.
