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They have been searching for and finding treasures all over Ukraine - on the ground and underground. Now it's time for underwater adventures. In Crimea, at the dark bottom of a mysterious bay, lies the Som, one of the first submarines of the Ukrainian Black Sea Fleet. Almost a hundred years ago, it was sunk by the crew to prevent it from falling into the hands of the enemies of the young Ukrainian state.

On board the Soma is a real treasure that can reveal many secrets and change the way we think about one of the most heroic episodes of our history. But what kind of monster guards the entrance to this bay? And who else is hunting for this underwater treasure to take possession of it and destroy the secret? Our old friends, the tireless treasure hunters from Kyiv, Danylo and Bohdan, their friend Halka from Poltava region, and the constant member of the fearless team, a fighting African ostrich named Football, want to find out. The third part of the popular detective series about the lives of modern schoolchildren hunting for treasure offers even more adventures and unexpected discoveries. And it also reminds us that we should love our country...

The new adventure detective story by popular Ukrainian writer Andriy Kokotyukha captures the imagination from the first to the last page.

The book is available in the Yakaboo app for free reading in the PrivatBank library.