“During that time, the ship’s transponder, which charts its movements on the so-called Automatic Identification System, shut down in what is known as a “dark incident” in marine traffic jargon. The ship then continued even as the dragging anchor greatly reduced its speed, according to satellite and other data reviewed by investigators.”

Double oops!

So blatantly obvious. There should be serious consequences. Banning Russian-crewed ships seems like a reasonable start