Saturated ground loses bearing every wet season. The pier goes below the layer that changes.
In Bonaire the ground under a foundation changes strength with the season. When the water table comes up the soil loses bearing capacity, so a footing that carried the house comfortably in autumn is sitting on markedly weaker material by spring.
That is the layer a pier has to get past. A helical pier is advanced until the torque says it has reached material that carries the load in any season, which is what takes the seasonal variation out of the equation.
Turning the pier in is an advantage in saturated ground, because nothing relies on the structure holding steady while it advances. Each one is installed and verified individually, and the recorded torque values give a documented result for the whole job.
The scope is fixed before we start on a Bonaire home, so nothing gets added once the crew is underneath.

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