Notes on verification

Verbatim wording traces to a single IUCN press release, widely republished rather than independently corroborated. However, the underlying facts (deepest known vent fields ~5,000m; vent fluid temperatures reaching/exceeding 450C, e.g. Beebe/Piccard field) are supported by independent peer-reviewed geochemistry studies. [cascade flags: aggregator_dropped_primary_exists,wikipedia_dropped_other_sources_exist | tier=silver indep_score=0.89 clusters=5 claim_tier=notable | framework convergence=partial on IUCN Red List press release for the exact wording; independently, peer-reviewed vent geochemistry studies for the depth/temperature figures (upstreams: IUCN Red List of Threatened Species (July 2026 update), Beebe/Piccard Vent Field geochemistry studies (Webber et al. 2015, McDermott et al. 2018)) — publishers independent, evidence may not be | kind=empirical eligibility=high]