in 2001 this Russian Foxtrot sub was retired and the Russian Navy decided to donate it to a museum, but they don't make museums on the beach. So, they took what assets they had, tanks, and dragged it to where they wanted it

In 2004, the museum was replenished with the highest exhibit (24 meters). This is a low-altitude detector and a target illumination station, which are part of the S-300 medium-range anti-aircraft missile system.

According to the press center of AvtoVAZ OJSC, some exhibits exist in a single copy. In particular, one of the main exhibits is a diesel submarine of Project 641 "B-307", whose length is 91 meters, and the height is approximately equal to a five-story house (14 m), weight - 2,000 tons

The B-307 was built at the Gorky Shipbuilding Plant in 1979. The total number of such boats in service with the Russian Navy was 18. The B-307 is the largest diesel submarine in the Russian Navy. NATO sailors call it "Tango", Russian - "Foxtrot". The submarine is slow, maneuverable. Carries on itself 24 torpedoes and 32 anti-submarine mines. In autonomous navigation can be 90 days. The duration of the B-307 combat duty as part of the Red Banner Northern Fleet was 22 years.

In 2001, the submarine was prepared for write-off and transfer to the AvtoVAZ technical museum. By that time, the museums of Moscow, Kaliningrad, Hamburg (Germany) and Brühl (Belgium) had the same submarines. At first, the fleet wanted to simply donate a boat to the museum, but this was not allowed by the federal authorities: according to the law, federal property cannot be given away for nothing. The museum had to buy a boat for a symbolic price - for only 768 thousand rubles. Not much, considering that the Moscow Museum at one time laid out 48 million rubles for a similar exhibit.

The submarine B-307 was supposed to be in Togliatti in the summer of 2003. However, due to the tragedy that occurred in the Barents Sea when transporting the K-149, as a result of which people died, the Ministry of the Navy demanded that transportation in Avtograd "B-307" were enhanced security measures.

The preparation of the boat for the transition from Kronstadt to Tolyatti took several months. The boat was carefully sealed, it was freed from solid and liquid ballast weighing 354 tons, dismantled a number of nodes and installed on pontoons. On the pontoons with the help of two tugboats, the B-307 began its long journey to Tolyatti from the Gulf of Finland along the Neva River. In one night, a train of about one hundred and forty meters in length went through all eight bridges of St. Petersburg. Equally successful was the echelon of the Ladoga, Onega and White lakes, and the Rybinsk reservoir. The crew of the boat escort consisted of a few vazovtsevs, the Navy’s search and rescue specialists and the chief consultant for the preparation of the submarine for the transition - midshipman Mikhail Golotyuk, who served on this boat for many years.

The future museum exhibit was moored in the Togliatti river port, and then driven off to the village of Primorsky, where a berth was specially constructed for the B-307. In the fall of 2004, the submarine was pulled out of the water onto land, and in the winter of 2005 it was taken along a specially cleared 4.5-km long road to the museum. Before removing the submarine from the water, Togliatti engineers specially traveled to Kronstadt to see how the submarines were raised ashore for repair. This is a very difficult operation, for which a whole year was being prepared. To the museum site, the submarine was rolled on ice. From the bank of the Volga "B-307" towed 9 military towing vehicles on tracked undercarriage. In total, for the transportation of the submarine, 15 units of military equipment were used, specially discharged for this purpose from the military ground in Totsky.

Undoubtedly, the B-307 is the pride of the Russian submarine fleet and the man-made monument to the Gorky designers who created it. Designers who not only forever inscribed their names in the history of the Navy, but also showed how our engineering thought overtook the ideas of foreign scientists. The valor of Soviet and Russian engineers is admired all over the world: the “twin” of the “B-307” - the diesel boat “B-515”, has been in the National Museum in Hamburg for several years now - the cradle of the military fleet. The uniqueness of the museum specimen is that, unlike other submarines acquired by museums, the Togliatti submarine was transported entirely from Kronstadt to Avtograd, without cutting the ship into pieces. Nothing like this has ever happened in the world. Similar submarines purchased by other museums have always been transported in parts.

the technical museum of AvtoVAZ OJSC http://www.city-on-volga.ru/ru/dobro-pozhalovat-v-toljatti/tourism

https://fishki.net/2115491-kak-samaja-bolyshaja-dizelynaja-podlodka-vmf-rossii-okazalasy-posredi-stepi-v-tolyjatti/gallery-3904497-v-itoge-muzeju-lodku-prishlosy-pokupaty-za-simvolicheskie-768-tysjach-rublej-simvolicheskie-potomu-chto-tochno-takuju-zhe-podlodku-moskovskij-muzej-pokupal-za-48-millionov-rublej-photo.html

https://war-museum.livejournal.com/105796.html
https://enrique262.tumblr.com/post/179916367655/literally-tying-half-a-dozen-tanks-to-a-submarine