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The external morphology of the ring structure has changed significantly to the time of the survey on 11.04.2016 since its first occurrence on 14.04.2016 (dynamics of change in Kouraev et al., 2019). The object was a round-shaped area ~ 7*8 km in size (slightly elongated in the NE direction). In the northern part of the area, there was open water; the southern part was occupied by accumulated crushed ice collected in a corner by the wind from the rest of the area. Around the structure, there were many cracks, thinning of ice when approaching the edge of the ring. A joint group of specialists from VSEGEI and «Baikal Center» selected 13 water samples in nearsurface conditions from two profiles. Sampling was carried out using a «Hivus»-type hovercraft. The first profile is 700 m long in the SE edge; the second profile is about 7 km long from the SE edge through the center toward to NW edge of the ring structure. Thermal degassing of water was carried out the next day: the gas was collected in upside-down glass vials (30 ml), which were preserved by the salt brine, a rubber stopper, and a plastic cap. A gas chromatographic analysis was performed 14 days later at «Sibgeocom» (Irkutsk) on a Chromos GH-1000 (Fig. 1D).

Hydrogen-carbon dioxide anomaly within the boundaries of the Holy Nose ring ice structure formation (Svyatoy Nos Peninsula)