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People have always wanted to swim like fish, cutting through the endless depths of the waters. After years of complex research, endless development, thousands of arduous and dangerous tests, and a lot of money, submarines appeared. Hundreds of meters long, tens of thousands of tons of weight, thousands of tons of displacement, advanced technology inside and out. All of the above is obvious, but what else might we not know about submarines? For example, that humanity, in its desire to quickly move through any obstacles, tried to create analogues of submarines that are able to move underground. #ItInteresting Anyone who wants to support our channel can become a sponsor! / @tointeresujace7074