Together with the Summit Foundation, Noam Yaron conducted an eco-sport challenge and used state-of-the-art eDNA technology to sample biodiversity from ten of Switzerland’s most beautiful mountain lakes. On this odyssey, we discovered the many treasures they hold and documented their biodiversity so that we can better preserve them. From golden algae to house-building insects to non-native fish, enjoy reading what eDNA can elucidate from a cup of water.