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In Riga, in the forests of Mangalsala, a real treasure for lovers of military history and adventure is lost. The fortifications of the Ust-Dvina fortress. Their task was to not let the enemy into the city if he came from the sea. And if he entered by land, then not to let him out. The real gates of Riga, which were kept locked. Six concrete batteries have survived to this day. But historians know: there should have been another battery with the most powerful guns - 305 mm caliber. Such guns could send battleships to the bottom - artillery armored ships. But - no traces of this battery have survived. We organized an entire expedition to search for it.