NDR (Norddeutscher Rundfunk), a public radio and television broadcaster in northern Germany has broadcast a TV program (only 3vminutes long) on Fehmarnbelt tunnel dredging work.

The world's largest floating dredger excavates the seabed ten meters deep so that the tunnel elements can be lowered.

https://www.ndr.de/fernsehen/sendungen/schleswig-holstein_magazin/Komplizierte-Baggerarbeiten-fuer-den-Fehmarnbelttunnel,shmag94022.html