Leave the Nali to his prayer now. Emerge from his hut and head round to the back of the modest homestead, where a tunnel leads into the cliff. Enter it, but watch out for ceiling-hugging Tentacle creatures best taken out with your Automag. Crates in the tunnel before you reach a cave will reveal a Clip and a Flare.
Whilst in this tunnel, although there is plenty of light to see by, it is a good time to try out the Flare effect if you are playing for the first time. Use your inventory select keys so that the Flare icon is highlighted (you should have several by now; the quantity is represented as a number on the icon), and press your inventory use key. You will toss a Flare to the floor, where it will act as a temporary source of light to the surrounding area until it blows up after a certain time period. Having tested this, proceed to the cave.
The cave has a couple of Tentacles, so shoot them down with your Automag or Dispersion Pistol. Before shooting any containers open, climb the stack of wooden crates by one of the large equipment boxes and get up on top. On top of the boxes can be found a Health Pack, a Flare, 40 Tarydium Shards (Stinger ammo) and an Assault Vest armour item.
Get back down from the boxes now and shoot open any wooden crates or vases in the room. You will find further Flares, Clips, Tarydium Shards, Health Packs and Bandages.
If you want you can go down the other tunnel. There is not much to see, but if you drop down to the water climb-out platform when you emerge at the other end there is another Automag and a crew member's corpse:
"Log: Guard M. v. Wely: I should have stayed with the others, I think my leg is broken in several places. My brother went looking for help 8 hours ago."
To get back up from the water climb-out, step on the raised area of the platform. It will lift you back up to the tunnel entrance. Now, return through the cave and back up to the entrance to the mining bunker, via the elevator you used before.
If at this point you require a health boost, you can pop back out to near the Vortex Rikers where you can go either side of the bunker entrance to pick up Nali Healing Fruit. Otherwise, head on deeper into the bunker. You will arrive at a lift upwards, so press the red button to call it and step aboard.
In the next room there is a Clip on the floor and another lift, plus an Assault Vest on a large box. Use the lift to ride to the balcony above, and drop downwards on to the doorframe below where there is a Clip. From that location you can easily hop to the Assault Vest. Now ride back up to the balcony and follow the corridor. There will be a LesserBrute guarding the exit, so dispose of him. A crate reveals a useful Health Pack.