"Well, would you not agree that the door with no pipes pointing at us, would be the logical answer?" Andrew replies.
" if you think we should go for three, then I'll reluctantly go through it for you"

"Stand to the side."

Emilia stands to the side also and pushes door 3 open.

A light scented breeze is puffed out of the pipe pointing to the door. It brings a feeling of peace and happiness and you all smile in lazy pleasure before collapsing to the ground.
After a few minutes, the team regains consciousness.

"Here, a pick me up" Emilia hands Naru and Andrew some powder. "Take a deep breath of it"

Naru breathes in the powder before saying "well that was a rather good experience, if time wasting and annoying".

Naru looks around the room they've now entered.

The only thing in the room is the large bulky machine the is connected to the pipe.

"Ok...so we have to choose another door," Emilia says, annoyed.

Naru goes back out of the room to try door number one.

"Gas masks!" says Andrew walking over to number two. Positioning himself on the wall to open door number two.

When door 1 gets opened, the machine behind it clicks and whirr's, and the light coming in from the stairwell room goes out. The wooden door at the top of the stairs creaks open and the rustle of movement is heard.

"We need to get out of here. They are coming for us!"

Emilia pushes Andrew aside and opens door 2.

The machine on the other side of door 2 detonates, destroying the doorway and part of the other 2 rooms while seriously wounding Emilia. The rustling can be heard as thousands of feet shuffle towards the stairwell.

"Mother******!"
Emilia falls to ground hurt.

"Naru, help me into the first door."

"Shit! Quick!" Naru shouts and opens door one, getting Andrew to help carry Emilia through.

"Naru, take my deagle. I need to heal myself. Close the door!"

Naru shuts out the lights in the outside room then shuts the door. Naru then takes Emilia's deagle.

"perfect! Can you heal yourself??? Bloc the door! Quick!! We needs buy some time!"

"I just need to get my legs working again. Someone check this room."

The room is another stairwell that leads up to ground level again. Before the stairs, there are a few tables with computers on them, apparently showing security camera footage.

"Fantastic" Naru begins stacking chairs and other heavy items, except the computers, to place against the door.

Emilia's legs begin to heal.

"What's showing up on the computers?"

Naru goes to the computers, and turns them on.

The computers were already on however, and they display several different rooms.
Camera 1 shows the helipad, and their pilot taking a piss in the snow.
Camera 2 shows the entry hallway with the crates and sand sacks.
Camera 3 shows the corpse room from a different angle, on the other side of glass even though there was no windows in that room. the lights are out and it is hard to make out.
Camera 4 displays the stairwell which is also cloaked in darkness.
Camera 5 Shows the room with the three doors. There is no sign of the thousand corpses.
Camera 6, 7 and 8 have 'REROUTED' on their screen.
Camera 9 show Martin and two other men in some sort of struggle.

"Martin!" Emilia gasps.

She struggles off the floor and limps to the computers. She checks to see if there is a microphone attached the computers.

There is, and it appears to be the source of that original message.