After reaching Da Smasei Laman, spend some time to learn the area. Use the binoculars to mark all the enemies that you can see (there should be at least one on the watchtower) and take a look at the ruins on your left, towards which you will need to go. It is best to stick to the rocks on the left, as this part of the base should be less guarded.
Head towards the entrance to the ruins, but remember that after you go in, you will start encountering single enemies that weren't visible to you earlier. Slowly search the halls and use your pistol to put the opponents to sleep (try to hide their bodies so that others don't notice them).
After entering the caves, you still need to watch out for more enemies. Try to neutralize the soldiers as you go. Because of the lack of good covers around, you will need to lay on the ground. After reaching a large cavern, go to the smaller chambers connected to it. Honey Bee is lying on the ground in one of them. Its location is shown on the screen above.