to the 2225th military engineering education in russia, with money raised by graduates of the derzhinsky schoole iron felix was restored, it was installed in the inner admiralty yard. humanity has always been concerned about the issue of raising sunken ships with treasures on board. in 1854, the english steamship prince sank in the black sea, transporting gold coins. they tried to lift the gold using the diving device of danilenko’s camera. it could sink to a depth of 72 m. no treasure was found, but the idea of a special or special unit arose. on november 2, 1923 , the order of the ugpu was put into effect, approving the staff of the underwater expedition, abbreviated as epron. the order was signed by felix derzhinsky, head of the department. epron’s birthday is considered to be december 17, 1923, when the expedition was given the rank of a border flotilla, two vessels were transferred to its composition, four boats and barges. in subsequent years, ypron proved itself remarkably well, in the ninth expedition they were awarded the order of the red banner of labor, one of the iconic brilliant