Cozumel will be your first location in Shadow of the Tomb Raider. It's a separate part of the map to which you can return at any time. You'll find 2 relics, 1 treasure chest, 1 document and 3 survival cache in this zone.
Rearguard report (1) - You will find it in the northern part of the location, next to the passageway to the other side of the cave. This document is right next to the survival cache.
This document lies on a bright wall. However, it is not very visible. If Lara approaches it, the game will automatically indicate that something is there. When you pick up the item, it turns out that this is the first document available in the game.
To open a treasure chest - Gold Mask (1) - available in Cozumel you need a lockpick. You can buy it from Moraekah merchant. Check our separate guide section about whereabouts of Moraekah the Merchant (Where I can find Moraekah the Merchant?).
If you want to get to the chest you have to return to Cozumel. There, after using a rope to pass through, cut it and tie it to the next point. Go through the rope to the other side, there you will find a Gold Mask chest.
Ceramic Jar (2) - at the extreme right end of the main room you have to climb to the platform - on the right side of the wall. There you will find ceramic jar.
Carved Bowl (3) - this relict can be found underwater.
First survival cache (1) - it's located underwater.
Second survival cache (2) - you will find it to the right of the entrance to the cave, it is not hidden in any way, but it is in a dark corner.
Third survival cache (3) - in order to get the last package in this location you have to descent from the wall and jump on the next shelf. In the screen above we've shown you where you should perform this manoeuvre.