The team that discovered the Baltic Sea anomaly suggested the sonar image showed an object with unusual features of seemingly non-natural origin.
Notes on verification
Directly confirmed by Wikipedia text and corroborated by independent reporting (Marine Insight, Fox News/NBC News) describing the Ocean X team's own characterization of the sonar image as unusual and seemingly non-natural. [tier=unverified indep_score=0.3 clusters=2 claim_tier=notable] [rescored 2026-09-15: curated origin-host map (PR #65); unclassified hosts no longer scored as aggregators]