The world heritage site Bryggen in Bergen (Norway) has been threatened by oxidation of the soil. That soil is a human made soil, and contains all kinds of organic materials. After the construction of a sheetpiling, that soil got into contact with less and less water. A large project team was formed, and enlarged in time. This team consisted of several experts. Michel Vorenhout was asked in 2011 to measure and interpret the redox potential of the soil.
In archaeological sites, it is always difficult to work. In general it is impossible to make holes, or use disturbing machines. We had to try to get our probes down into a soil, where we were also expecting large stones and other objects, besides a more woody organic layer. The team came up with a push rig, which uses a 3.5 cm pin. The pin was pushed and drilled down. We installed probes into the hole thus created.