We get seasick just watching the video! According to the original post:
A rescue vessel operating in the North Sea off the coast of Great Britain recorded terrifying footage of the high seas brought about by storms ravaging the area in December 2018.
Taken from the bridge of the ERRV (Emergency Rescue and Recovery Vessel), the filmer caught the immense waves on camera, some looming higher than the vessel.
The footage only surfaced last Thursday (January 10) after the ERRV put into port, having spent at least a month at sea searching for ships in distress.