This page of the Horizon Forbidden West guide contains information about Sunken Caverns.
The mask allows you tostay underwater for as long as you want.
It also doesn’t have to be activated manually.
Aloy automatically uses the mask when underwater.
This lets you dive as deep as you wish without any limits.
This is not possible without the mask.
Exploration
There are many resources to be found in the sunken caverns.
The one that should interest you the most isGreenshine.
It’s a special resourcerequired for weapon upgradesin the late-game.
“Completing” a location means obtaining all the resources (Greenshine) available in the area.
Using the Focus should make your job much easier (R3 on the PlayStation).
It will show you all the resources obtainable nearby.
There are several areas such as this one on the map.
They’re marked with a special icon resembling waves, as pictured above.
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