Vladivostok 2020-05-23 VLADIVOSTOK, RUSSIA - MAY 23, 2020: The chief designer at the Rubin design bureau, Dmitry Semyonov is seen during a ceremony marking the arrival of the autonomous unmanned deep-sea submersible Vityaz-D aboard the Russian Navy Pacific Fleet's Foty Krylov tug in the port of Vladivostok on Russia's Pacific coast. Vityaz-D is the world's first unmanned submersible to descend into the Mariana Trench in the Pacific Ocean. The submersible reached the bottom of the Mariana Trench on 8 May 2020, at 22.34 Moscow time. Designed by the St Petersburg-based design bureau TsKB MT Rubin, Vityaz-D can dive to a depth of up to 12km and overcome obstacles and find its way out of caves and trenches using artificial intelligence. Yuri Smityuk/TASS Foto Yuri Smityuk / ITAR-TASS / TT / kod 225 ref: ***BETALBILD*** OBS Bilden kommer från den statliga ryska nyhetsbyrån Itar-Tass