We usually associate museums with boring exhibitions that showcase historical objects of cultures from the distant past. Many museums are now trying to attract new visitors by changing the way they display their exhibits. However, the museums we shall present in this article do not need to put a lot of effort into luring visitors because they themselves are incredible. However, access to them is somewhat difficult. Why? These museums are hidden deep down in the sea. What can you find in them? Many mysteries that still remain undiscovered...