The investigation of this site was started in 1951 in a sounding trench on the western side of the cave,[1] which was 10 x 10 x 2 meters deep.[2] In 1952, the second sounding trench was excavated horizontally atop the first trench[3] that was 7 x 6 x 5.5 meters deep.[1] Finally a deep sounding trench that was 3.8 X1.6 X 6.5 meters deep was excavated which gave the total excavation depth to be 14 meters deep.[1]