Underground astronaut training in Skocjan caves regional park, Slovenia

Sentinel-2 MSI acquired on 01 January 2017 at 10:04:12 UTC
Sentinel-1 CSAR IW acquired on 18 September 2019 at 16:58:02 UTC
Author(s): Sentinel Vision team, VisioTerra, France - svp@visioterra.fr
Keyword(s): Land, river, erosion, ESA, UNESCO World Heritage, Slovenia
Fig. 1 - S2 (01.01.2017) - 4,3,2 natural colour - The Karst Plateau region lies between Italy and Slovenia.
Fig. 2 - 11,8,4 composite - It gave its name to karst topography, characterized by underground drainage systems with sinkholes & caves.
Fig. 3 - S1 (18.09.2019) - vv,vh,vv composite - It is formed from the dissolution of soluble rocks such as limestone, dolomite & gypsum.
Fig. 4 - 4,3,2 natural colour - Speleology was born in these caves, chosen as a training ground for astronauts within the CAVES program.