There was an article on the front page recently where they found plastic particles in the cells of creatures in the Marianas Trench. It's plastic all the way down.

How concentrated? Do you have a link to that article?

Sorry I didn't see this when you posted but here are stories I found on the topic, the news doesn't cover concentration but does mention they found plastic in a higher percentage of samples versus earlier years surveys did not find nearly that much: https://www.nationalgeographic.com/environment/2019/02/deep-... source article: https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.1806... I distinctly remember reading the researchers made sure their probes and sensors were plastic free somehow before they sampled the digestive systems.

Not uncommon at all. Every organization that has anything to do with marine rescue (including pelagic or shore birds) has to deal with this kind of thing routinely.

How often is 'routinely'? Can you provide a source?