Looks like some goverment folks in Estonia choping up some surplus Tokarevs and Makarovs.
My Grandfather was in the U.S. Army Quartermaster Corp (Lt. Col.) when WWII ended. He told me of taking barge loads of excess Thompsons, M-3s, and all sorts of rifles and pistols into the Gulf of Mexico off Lousiana and pushing them into the Gulf.
The Army had more excess weapons than they could store, so huge quanities were given the deep six.
Huge amounts of equipment was dumped in the Pacific at the end of WWIIl rather than bring it back to the States. They didn't need it, and it would cost a fortune to collect, , transport it back to the states and store it.. it is all about economics. Tanks, aircraft, trucks, field hospitals, artillary etc. etc. over the side.
Looks like the Estonia folks are doing the same thing, but recycling the metal.
This kinds of stuff happens all around the world on a regular basis..no need to stroke out about it.