Businessman Sergey Baburin had been riding cross country with pals in a forest near Schukovo in Russia's remote Ivanovo Oblast region.
But when his snowmobile got stuck in a frozen stream, he revved it hard and broke through the ice, revealing a huge catch of fish.
A video of the discovery shows the dense mass of fish in a pool of water with Sergey saying on the soundtrack: "I cannot f***ing believe it!"
He later told local media: "My snowmobile fell under the ice of a small creek and we could not get it out, so I decided to push on the accelerator."
As he did, the ice cracked revealing the teeming mass of fish