Found this when snorkling in Greece about 17 years ago when i was just a kid. Always wondered what it was... Anyone an idea? Almost certainly made of metal and i think it is hollow on the inside.
Phew. The small size, combined with other people surmising it might be part of a refrigerator greatly alleviates my worries you might have picked up a piece of unexploded munitions from WW2. Which is an all too common thing over here in Germany.