Thai policeman sticks his head down a hole

This picture in today’s copy of the Bangkok Post is begging for a funny caption. What exactly is this policeman doing with his head down a hole? And what’s that tree doing there in the middle of the road? Is this part of the BMA’s “Green Bangkok” project? In reality, it is another sinkhole on a Bangkok road. This time near Rangsit Market.The branch from a tree is there to warn traffic.