Geyser, Vapor condenser, what you need.

[Virkful]

So the new content "Vapor Condenser" is a very late game content, due to it needing composites to be crafted.
Difficulty: Desert > Arctic > Forest
Wave 1: Hyena / Wolf / Wolf
Wave 2: Cougar / Snow leopard / Jaguar
Wave 3: Scorpion / Polar bear / Bear
Each geyser site can be activated 3 times for exotics, after that you get condensed geyser or something for trophies (I threw it away so can't remember the correct name)
You will be rewarded a total of 100 (25+35+40) exotics when completing all 3 digs at site.
(I think its a bit low, could've been 150)
Geyser site can't be scanned, you have to spot them.
Vapor condensers do not require energy source, and it can be re-used on another site, so bring 1, and maybe a spare one in case you fail to protect it.
It sits in normal backpack slots, not the back(G slot), so you can carry multiple of them, they don't stack though.

If you're solo-ing, suggestion below:
1. At least 2 hunting rifles, lots of enemies, so you'd be dead if one breaks while in middle of the waves.
2. Fabricator and spare titanium ingots for rifle repair.
3. 200 bullets per geyser spot you wish to fully complete. (So if you're going through 3 sites, you'd need about 600 bullets or more)
4. Fortification material, whether it being building / hedgehog / fireplace.
5. Bed, build it slightly away from the site, so when you die, you don't have to run all the way back.

Why desert > arctic > forest?
Well, the first 2 waves are nothing, only the third wave that's deadly.

For desert, you will have about 15~20 scorpions charging at you AT THE SAME TIME, so it's very pressuring, their poison stings are also deadly, one poison is enough to kill you. Hedgehog will help you kill off a bit of them, but they charge at a straight line, so once a line breaches, all breaches, they'll charge straight at you or at the extractor.
Due to their height, you're unable to attack them when they're infront of the hedgehog, so, build a HUGE fortification, when I say huge, I mean buildings + 100 or more hedgehogs.

Arctic, you will have 2 polar bears charging at you at the same time, total of something like 10 polar bears, no big deal if you have 2 hunting rifle, swap shooting, they'd be dead before reaching you, even if they reach, the hedgehog will save enough time for you to finish them off.

Forest, I actually haven't digged this one yet, but I'd assume it's pretty much the same with arctic, maybe 3 or 4 bears at once, but bears are so less danger than polar bears, they could be one shotted on headshot, so no big deal.

Personally thinking, the new content Vapor Condenser is quite challenging, I'm ok with 100 exotics per site, but felt it could've been better, like 150 is a decent number, you have to think that it requires you to reach the stage of being able to craft composites, and it's active combat, unlike traditional way of drilling exotics where it only aggros nearby predators, and when drilling normally yields 120+ per site, 100 just seems a little less.

I tried them on hard mode, so probably not the best experience for exotic farming, arctic was pretty tense, to a stage of good balance, that scorpion zerg was just too much, but it was kinda fun getting bulldozed over by them.

[Mourn]

Forest Outpost was about 50 wolves, then 20 Jaguars with 2 people, that's just wave 1. I stopped the machine as I was only testing a defence set up, so no idea how much worse it gets.