GPS Cache (Shipwreck Beach):
Left of the grenades you can see some horizontal wooden boards. Jump towards them and use them to climb up to the top. Face right and climb onto the roof, where you'll find the next GPS cache. Get back down.
GPS Cache (Shipwreck Beach):
Run between the watertower on the left and the crane on the right to find another GPS cache.
Document (Shipwreck Beach):
On the inner side stands a crate with a document on top.
Enter the Research BaseYou can not reach the dangling platform with a simple running jump so use your rope arrows to pull it closer. Jump over and do the same with the second platform. Jump over, pull up and - since the platform starts to fall - running jump towards the safety on the other side. Get down onto the lower level and running jump from the ramp here towards the rope, which you will then slide down. Collect the shotgun shells if you have need of them. Wall scramble up to the pipe and use it to climb around to the right. Jump across the gap to the small remains of the pipe and then again towards the right end. Follow this to the ladder. Climb up. Use the axe to traverse the wall and reach the salvage crate at the top. Jump over to the left to reach solid ground. At the top are two Solarii heatedly discussing something. I recommend wall scrambling up and hiding behind the crates instead of using the stairs. When their talk is over they should have their backs turned. Use the bow to headshot them and dispose of them silently. Loot them for salvage and pick up the rifle ammo. The large gate is closed, so approach the scrambling wall left of it and jump up to grab hold of the top ledge. Shimmy over to the left end and here jump over to the climbing wall. Use the axe to grab hold. Climb towards the left and up to the top. Here stand next to the pillar and shoot a rope arrow into the climbing wall across the chasm. Slide down. Here climb further to the left. Jump across the gap to the next climbing wall. Climb right and up to the top. Jump to the ladder and climb up. Break the salvage crate before you use a rope arrow and the rope ascender on the rubble blocking the passage. Step inside and out on the other side. At the end turn left.
Discover the Ancient TombJump towards the climbing wall and head downwards. Let go to drop down into a passage partially flooded.
If you have any grenades, turn to face the blocked wall in the north-east, shoot it and head through. Collect the salvage crate and then look up to the left. Use another grenade on the blockade there. Wall scramble up and collect the relic.
GPS Cache (1):
On an outcrop on the left lies another GPS cache.
Sun Killer Challenge (1):
Before you climb down, look up to the left of the light bulb to spot a sun symbol. Shoot it (using the bow to conserve precious ammunition).
Sun Killer Challenge (2) & GPS Cache (2):
Nearby is a door with a light above. Break it open. Before you move away, take out the bow and shoot the sun in the opening opposite. It is in the opening on the right, where the corpse is. Zoom in. Next running jump towards the opening opposite and climb through. In the niche you will find an XP crate and a GPS cache. Climb back out into the water passage.
Sun Killer Challenge (3):
Turn around to spot the next sun dangling from the roof of the passage. (This can also be spotted if, from where you land when exiting the opening, you turn right (towards where the baddies awaited you - east) and look straight up.
Discover the Ancient Tomb (The Elevator)You will come towards a cargo elevator. Press its button to figure out what is going on. The elevator is jammed. Climb onto the stack of crates on the right and use your axe to remove one of the cogs. Climb up onto the elevator and out onto the upper part of the stairs the other side - otherwise unreachable yet. Head back down and pry open the door for later use. Head up to level 3. Here you find pistol ammunition and a document in the niche. You can also use fire arrows to shoot down the salvage crate above the stairs leading down. Head up to level 4, jumping across the gap in the stairs on the way. There are shotgun shells in the niche here. And overhead, facing north, is another salvage crate which can be shot down. Ready your shotgun. Call up the elevator to level 4. Before it gets all the way up, jump onto it and use the shotgun to shoot the barricade on the right. Jump through and use the axe to grab hold at the wall. Climb over to the left and jump across the gap. Use the axe to grab hold on the next part. Climb further left. At the end, drop down, collect the salvage and pry lose the cog through the opening. (This only works if the elevator is on level 4, which it should by, unless you did not follow my walkthrough all the way.) After prying the wheel lose, drop down and head further down the stairs to get back down to level 3. Climb up the ladder near the elevator controls. Through an opening on the right you can pry lose the third cog. (The elevator should still be on level 4.) Call the elevator back down to level 3. Head down the stairs. When you are between levels 3 and 2, look up to find a niche with a salvage crate. When coming from above - facing north - you can jump up there. Break the salvage crate and then pry the cog lose. (The elevator should be on level 3.) The elevator will crash down. Get back down to level 2 and jump into the elevator shaft to get to the bottom.
Sun Killer Challenge (4):
When you step onto the 1 on the floor, look right to spot another sun.
Relic (2): On the right, behind the stack of crates lies another relic.On the other side of the stack is a salvage crate.
Sun Killer Challenge (5):
Look through the fence to spot another sun. Shoot it.
Map: At the bend climb over the crates on the left to find the map in the niche behind. Climb back out.Head over to the right. Collect the rifle ammo. Pry open the third locker for salvage. Collect the XP crate.
GPS Cache (3): Climb onto the long row of stacked crates on the right side to find another GPS cache at the end, behind the crates. Get back out.Head out towards the tomb. Go up the stairs to the Stormguard General.