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At the end of the World War I, the German navy sank their own naval fleet rather than handing it over the British Royal Navy, going against Treaty of Versailles. This was done at Scapa Flow, an archipelago north of UK.
The scrap from the sunken fleet became more valuable after World War II and is being currently used in a scientific tool.
Can you identify how these scraps are being used?

Show Answer
The steel from the scrap is used for Geiger counter, used to measure radioactivity. This is because the steel was formed in pre-atomic era and is not contaminated.
Read More about the interesting incident.