Assassin's Creed IV Black Flag
Achievement: Vault Raider - Unlock the secret door in Tulum.
& Sequence 11 - ...Everything is Permitted

Mayan outifit. Gained by completing the Mayan Stelae activity.
"According to legend, this Mayan outfit was created using scavenged First Civilization materials, and has the ability to deflect metal projectiles."

The secret door is hidden in a tunnel at Tulum (70, 405). In order to unlock it, you will need to collect all 16 Mayan Stelae which are buried around the map. Fortunately, they are marked and it is mostly a matter of traveling to the locations for each one. When you reach a location that has a Mayan Stelae, there will be a totem pole-like structure to climb, and at the top you will need to press to interact with it. This will activate a mini-game where you need to align three white shapes with nearby terrain features and is mostly a matter of rotating until it clicks into place. When that is done correctly, you will reveal the exact location of the buried Mayan Stelae. Go to the indicated spot and press to dig it up.

The 15 Stelae not obtained in story mode are located as indicated below:

Cape Bonavista (179, 593)
Cat Island (742, 695)
Great Inagua (845, 468)
Isla Providencia (502, 44) - 2 Stelae
Long Bay (525, 253)
Matanzas (333, 650)
Misteriosa (307, 195) - 2 Stelae
New Bone (442, 118)
Santanillas (217, 250) - 2 Stelae
Tortuga (882, 370)
Tulum (70, 405)

After you have all 16 you can enter the tunnels underneath the only viewpoint at Tulum and use the Mayan Stelae to open the secret door. Once you have opened it once, it will never open again.

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