An eight-year-old dolphin named Shadow mysteriously died after being exposed to two days of techno music at a waterpark in Switzerland. The park was the venue for a weekend-long dance event, which exposed the highly sensitive marine mammals to nearly 48 hours of repetitive beats. Several days later, Shadow became agitated and died. While there is no way to prove a direct correlation between the two events, animal activists had warned park management that the noise from the event could cause undo stress on the dolphins who call the park home.

“We have reasonable evidence to suggest that the extreme noise levels from the two day techno party severely affected the immune system of the dolphins,” said Jürgen Ortmüller from the Whale and Dolphin Protection Society. “Dolphins are very sensitive creatures.  We warned against a techno party taking place in this location for these very reasons.”

Park officials deny any wrong-doing. Shadow was the seventh dolphin in three years to die at the park.