No One Left Behind

Find a Way Into the Solarii Stronghold

Walk through the tunnel and wade through the murky water. When you emerge in the small cave, go to the path on the left to find a small fruit plant. Then go back and follow the path leading to the stairs. 
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Tomb Raider (2013) Walkthroughs

Scavenger's Den · Coastal Bluffs · Coastal Forest · Mountain Temple · Mountain Village (First Visit) · Base Approach · Mountain Base · Base Exterior · Cliffside Village · Mountain Village (Second Visit) · Mountain Pass (First Visit) · Chasm Monastery · Mountain Village (Third Visit) · Mountain Descent · Shantytown · Cavern Entrance · Geothermal Caverns · Solarii Fortress · Fortress Tower · Summit Forest · Gondola Transport · Shipwreck Beach (First Visit) · Cliffside Bunker · Shipwreck Beach (Second Visit) · Research Base · Mountain Pass (Second Visit) · Chasm Stronghold · Chasm Shrine · Chasm Ziggurat