Unusual Way of Repairing Roads in Sibu

This photo by Philip Hii shows an amazing attempt of Sibu road builders to control the sinking of a small road. The round holes were made by the piling of bakau at equi-distance from each other. It looks like a piece of art.

Belian Road, Chung Hua Road,Bukit Assek Road for example,were actually heavily piled with bakau when they were first built and later during the repairs. But the roads continued to sink until today.

I am wondering what engineering miracle can take place to contain the great challenge of road building in peat swamps.