Sanae Chiba Team Logged 3,425 Deep-Sea Debris Items Before 2019 Mariana Bag Claim
Updated
Updated · spacedaily.com · Jul 15
Sanae Chiba Team Logged 3,425 Deep-Sea Debris Items Before 2019 Mariana Bag Claim
1 articles · Updated · spacedaily.com · Jul 15
Summary
A 2018 Marine Policy paper led by Sanae Chiba documented 3,425 human-made debris items across 5,010 dives, including a plastic bag at 10,898 meters in the Mariana Trench.
That database-based evidence predates Victor Vescovo’s 2019 Challenger Deep dive, where the widely repeated “plastic bag” was never recovered and was described only as an object that could have been plastic refuse.
Chiba’s team found more than one-third of the debris was macro-plastic, and nearly 90% of that plastic consisted of single-use items such as bags and bottles.
The deeper pattern is stronger than the famous anecdote: plastic appeared even beyond 6,000 meters and more than 1,000 kilometers from the nearest coast, showing routine contamination of the deep sea.