Subsurface problems occurred everywhere included in developed nation. Cavities or void, caves, caverns, tunnel, karst features, and abandoned mine could be the caused for the subsurface problems. Subsurface cavities can be natural or manmade. The most common natural cavities are those formed in limestone by dissolution processes. These natural cavities can be air – filled if above the water table, water – filled, and sediment – filled. Manmade cavities include tunnels and mines.
Subsurface Analysis is one of the main considerations for property developments in limestone areas. The ground characteristic at the limestone area are really important to be known for foundation design, both for construction and post development phase.