Reformed Offlian
Master Poster
40K kg heroin street price weighted average in 1994 was $118 per gram or €99 equivalent. That would be worth US$4,720k on the street or €3,960k.
As for osmium, it is currently $400 per oz., cobalt $36/lb.
Where there is brass there is muck and there is little doubt smuggling took place.
Given Sweden admitted it participated in smuggling Soviet military and space secrets circa Septemebr 1994, there was likely some very serious organised crime around these ferries.
So, if there was some kind of tip-off the goods would be intercepted at Stockholm, then you can see that a ruthless criminal isn't going to have much compunction trying to get rid of it to prevent customs getting it. I have no idea if this is what happened but it is not beyond the realms of possibility.
Doesn't answer the question: Why would somebody try to open the bow visor in the middle of the sea in the middle of a storm. "Because they're criminals" is not an answer.