Shavian, one of the issues on gas escaping is the amount of fracturing in the rock. The seismic forces that pushed the Alps to their current altitude have been channeled through the rocks EME is now drilling. That's one reason they're drilling where they are: a large piece of the geology has just sunk down between fault lines, trapping a chunk of anthracite at enormous depth. However it's also possible that the same or other faults have vented the coal seam and allowed a lot of the gas to reach the surface.
So far I haven't found any comparables for this venture. Most of the other CBM plays are near-surface or based on abandoned coal workings. In an odd way, that makes me rather more optimistic. We just don't know whether gas traps easily 2 km down because nobody else has tried drilling down to find out. My hunch is that the productive capacity of the anthracite could exceed the venting capability of the overlying rock. I'm quite curious to find out what happens when they reach TD -- shares or no shares.
Anyone fancy a trip to Neues Bergland with a parka and green wellies?