In this section, Martin Falklind comes to our lakes. Under the water lilies live fish and animals whose existence we know surprisingly little about. We meet researchers and get to know Sweden's largest lake fish, a predatory fish that can be three meters long. But it is the voracious pike with its six hundred teeth that has the main role in this section. We find out that both pike and perch along the Baltic coast are having a tough time, but that overgrown lakes inland have started to be restored to the clear bathing and fishing lakes they once were. We also meet lake fishermen from Mälardalen who show how they work with sustainable fishing.