It is Sweden's geological survey that works to investigate the seabed along the coast of Uppsala County.
The work will result in maps that show where you can build, or what are areas worthy of protection for plant and animal life.
Join a trip to the bottom of the sea
2020-09-23T03:32:19.196Z
With the help of an underwater camera that is celebrated down from the survey boat Ugglan, you get close-ups from the seabed off Gräsö. Watch the video to find out more about what is under the sea surface.
Source: svt