The Federal Maritime and Hydrographic Agency plays a key role in ensuring safety in German waters. Divers from the authority search for underwater obstacles in the Elbe.
On the Elbe, between Hamburg and the estuary. A northern German autumn day, the water is grey-brown, sometimes it rains. Large ships pass by, heading for the Hanseatic city or the North Sea. A boat rocks on the waves, "Ruden" is written on the bow. Three hoses in blue, yellow and orange, wound around each other in a spiral, lead from the boat into the depths. They lead down to Tjark Lange. The diver is travelling towards the bottom.
The blue hose is used for breathing. The compressed air flows through it from the cylinders on the "Ruden" down to Lange. The orange-coloured hose enables communication. Thanks to it, Lange's breathing can be heard in the cabin of the "Ruden". And also
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