Senior Lieutenant of the Navy Aleksey Alekhin, once descending to the seabed in a bathyscaphe, finds himself in a strange underwater cave that serves as a portal to a fabulous world. In this new unfamiliar place, he meets a little dragon left without a mother. Aleksey unwittingly becomes the dragon's guardian and friend and gives the baby the name Gorynych.

"You are forever responsible for those who have tamed... Even if is is a dragon!"