When simple skinny-dipping in the icy water became old and dull, the twins came up with a new fun game. Allegedly, their plan was to dive into two ice holes at the separate shores of the river and try to meet underwater before running out of air. If they fail, they consider themselves to lose the game and get punished with dying trapped under the ice all alone. If they succeed, they consider themselves to win the game and get rewarded with dying the same way together. Their bodies were never found though, so we can only imagine the outcome.