What happened

A field collection pipeline at Nobel Oil's Yuzhno-Osh field ruptured in the Usinsk district, releasing oil-containing fluid onto marshy ground and into waterways connected with the Kolva River. Komi authorities said the failure was found on 2 July and declared a high-alert regime. Rosprirodnadzor head Svetlana Radionova estimated that as much as 1,000 cubic metres could have escaped and accused Nobel Oil of withholding information and describing the activity as an exercise; the regulator said it learned of the spill from residents and the regional natural-resources ministry. Nobel Oil later reported only 0.92 cubic metres over about 4,000 square metres, leaving the scale sharply disputed. An 18-person response team was reported at the site, while prosecutors and investigators opened reviews. This is a separate operator and event from Lukoil's May 2021 Kolva spill. It is mapped approximately at Usinsk because precise rupture coordinates were not published.

When cited sources give different casualty, damage or spill figures for this event, they’re reported side by side above rather than merged into one number. See how confidence levels work.