The first dive took place in 1970, so this year Kjell Andersson celebrates 50 years as an explorer of the Öresund marine environment.

He once took the lead in the fight against the planned bridge construction across the Öresund, but once the project was started he took a job as an independent environmental controller for the Danish-Swedish bridge consortium.

- The bridge was, in a way, the first project in which the aquatic environment was taken seriously. The effects are clearly visible. Although many challenges remain, Öresund feels better for each passing year, says Kjell Andersson.

Watch the video with views from Kjell's 50 years in the service of Öresund and the environment.