When the tide goes out on Aberlady bay the wrecks of two World War 2 Royal Navy XT class midget submarines are revealed. In 1946 they were moored to a concrete block on the vast expanse of Aberlady beach and used as target practice by the Royal Air Force. The badly damaged remains were then left to rot.
What is left looks like the fossil of some mechanical dinosaur. It is brightly coloured by algae and rust. As the sun was going down these colours were greatly exaggerated.