Mayan Temple Mission

Use the text messages on the phone to deduce which mercenaries were paired together, and which paths they took.

Everyone exited the tunnel in room A3, and Brian and Ricardo first reported all clear from C2, meaning that B2 and B3 are both safe.

A text from "D" referencing "An" and a later text from "A" referencing "David" tell you they are a team.
They first reported all clear as they were entering B5, so B3, B4 and A4 must all be safe.

Yuri and Oleg first split up in D1, meaning A2, A1, B1 and D1 are all safe rooms.

An and David split up in D5, so that room is safe.

The Captain never heard from Brian and Ricardo again after they split up from C2, so D2 and C3 probably contain deadly traps and must be avoided.

Yuri last reported before he entered E1, so that room is probably not safe.

An went silent after splitting from David in D5.

Oleg went silent after leaving D1.

Since David reported from E4 after splitting from An, then An must have died in D4.

Mercenaries died in the following rooms:
Oleg - D2
Yuri - E1
An - D4
Ricardo - C3
Brian - D2

The Captain died before David reported finding something. David's last known location was E4.

David took the following path to the transmitter room:
A3-B3-B4-A4-B5-D5-E4-E2
The code for that path is 1218.