Figure 3. Thermal regime of subsea permafrost based on results of direct observations.

(a) Data show that along the re-drilled transect, sediment temperatures in boreholes 4D-13, 2D-13 and 4D-12 varied from −2 to +1 °C. (b) Examples of thermal state of sediment cores recovered from a few boreholes in 2011–2014; the results show that sediment temperatures varied from −3  to +1 °C, increasing downwards in some cores.