Fig. 5: Indications of methane gas and oil in sea water.
From: Widespread natural methane and oil leakage from sub-marine Arctic reservoirs

a Synthetic aperture radar (SAR) image s1b-ew-grd-hh-20200723t051748 (Copernicus Sentinel data 2020, processed by ESA) of oil slicks on sea surface and locations of gas flares, water sampling stations, and sediment cores. b Photograph of oil films taken during oil sampling in the vicinity of CTD 911 during CAGE 21-4 research cruise. c Compilation of monthly oil slick observations from April to October 2020. Source data are provided as a Source Data file.