We conduct many trips together with our partner Tom Pfeiffer from VolcanoDiscovery GmbH / VolcanoAdventures. This makes it easier to reach the minimum number of participants. If you book there, the conditions there apply. Our conditions don't differ much.
We are also open to further cooperation, because it is of little use if some tour operators offer similar tours and nobody finds enough participants and trips have to be cancelled. This is also in the interests of the customers, because it offers more certainty that a trip can take place.