What is the purpose of the pond in Desert Cantos?

What is the purpose of the pond in Desert Cantos? - Dry plants on shore of calm reservoir

In The Sarah Connor Chronicles, episode "Desert Cantos" (wikia link), a drone is seen leaving the pool. My question is simply what is really going on with this pool?

I do not recall seeing any real explanation for the pond itself other than some dead animals, plus if memory serves other episodes may have also shown activity around this too; I do recall a scene with it bubbling at least.






Pictures about "What is the purpose of the pond in Desert Cantos?"

What is the purpose of the pond in Desert Cantos? - Oasis in desert area in cloudy weather
What is the purpose of the pond in Desert Cantos? - High angle of colorful lake located among desert highland with steep slopes in bright day
What is the purpose of the pond in Desert Cantos? - Small shallow pond in sandy desert





POND IN DESERT SURPRISED US :)




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Images: Julia Volk, The Lazy Artist Gallery, Tomáš Malík, Francesco Ungaro