The article mentions heavy metals and asbestos, at the minimum.

jojobas · on Feb 24, 2023

Is any of that known to leech out to sea water in amounts dangerous to anything, or at least significant relative to natural trace content?

(Pretty sure it doesn't)

woodruffw · on Feb 24, 2023

Probably not asbestos, but lead and other heavy-metal leaching would probably depend on local water conditions.

jojobas · on Feb 24, 2023

Where would these be used in an average ship, or any ship in particular?

Lead is naturally found in sea water within 2-30 ppb.

To raise global lead concentration by 1 ppb you need to dump a few billion tons of lead.

It's often said that solution to pollution is dilution.

dan-robertson · on Feb 24, 2023

Anti-fouling paint used to have a lot of lead in. I think it might be other heavy metals now.

I’m not sure how quickly things diffuse deep in the ocean, but I would guess quite slowly.

ClumsyPilot · on Feb 24, 2023

We have dunped so much mercury into the ocean, that you can get poisoning if you eat tuna too often

jojobas · on Feb 25, 2023

Wrong, it's about the food chain concentrating mostly natural mercury in long-lived predator species.

>Mercury is an element the emissions of which from its natural sources exceed its anthropogenic emissions.