In the 1960s and '70s, Brunnen hosted international trains to Lecce, in Italy, and Hoek van Holland, in the Netherlands.
Gerolsteiner Brunnen GmbH & Co. KG (Gerolsteiner) is a leading German mineral water firm with its seat in Gerolstein in the Eifel mountains.
Although it is never clear exactly how the Brunnen-G actually defeated the Insects, when faced with the task of destroying Mantrid, Kai remarked that the Brunnen-G were able to defeat the insects because they were methodical, and therefore predictable.
He continued to embark on study trips, such as to the Valais (1858–1860), Italy (1861–1862) and Brunnen (1869).