Andaman Sea Section
Lara's notes on the expedition:
- Inscribed in stone around the doorway leading to Thor's hammer, Odin wrote: "Thor, greatest of my sons, and the greatest weapon on Earth, are at last reunited. Upon my return, through rituals old and the power of Mjolnir, together we will open the seals of Helheim and fulfill our destinies." I don't like the sound of old rituals, or if fulfilling destinies given how the ultimate destiny of the Norse is destruction at the battle of Ragnarök, but at least I have the power of Mjolnir and the means to extract the information I want from Natla. 
- Main article: Tomb_Raider_Underworld_Story#Andaman_Sea
With Zip having discovered the location of Amanda and Natla, Lara returns to Thailand, and infiltrates Amanda's sister ship. Using Mjolnir to smite any mercenaries foolish enough to stand before her, Lara fights her way below deck to confront Natla. "Avalon, Helheim, I don't care what it's called - where is it?" she demands.
Lara learns that any desire she may have for vengeance against Natla will have to wait, as only the Atlantean knows how to open the way into Helheim. When Amanda enters the room, she and Lara are poised to fight, but Lara's doppelgänger suddenly intervenes to hurl Amanda through a glass panel in the floor and into the depths below. Lara furiously attacks her near-identical nemesis, but once again, cannot land a clear shot before it escapes. When Natla comments on her behaviour, Lara smashes the glass prison and barely controls the urge to execute her on the spot. "Get out of my sight," Lara growls.
- Tomb Raider Underworld Journal Entry ANDAMAN SEA EXPEDITION