Karst systems are found in many regions around the world. In the order of 10% of the continental surface is karst (Ford & Williams, 2007;Mangin, 1975). Karst is incredibly complex and manifold, and the processes that dominate karstification strongly depend on the hydrological and geomorphological properties of the karstic systems, which are subject to constant change while karstification is ongoing. Essentially, karstification happens in soluble rocks in contact with water, typically at the earth's surface or close to it. Karst research has evident relations to the disciplines and sub-disciplines of hydrology, geology, speleology, geomorphology, hydrogeology, etc. Karstic rocks are typically carbonate rocks made of Calcium and Magnesium minerals, where limestone (CaCO 3 ) and dolomite ( 𝐴𝐴 CaMg[CO3]2 ) are the most important subtypes. During karstification, these rocks are eroded mechanically, and, more importantly, corroded chemically. The corrosion of calcite and dolomite is driven by the availability of dissolved CO 2 in the water.

Hydrogen is a promising energy carrier on a path toward a decarbonized society and economy. Green hydrogen (produced by water electrolysis) and turquoise hydrogen (produced by high temperature methane pyrolysis) are attractive CO 2 -free power-to-gas technologies in periods with a surplus of power from renewable energies. Hydrogen can be stored and subsequently converted back to electricity using a fuel cell at times of additional demand. As such, hydrogen, among other energy storage techniques like pumped hydroelectric storage and largescale batteries, can buffer the periodic fluctuations of renewable energies to stabilize the power grid (Bünger

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