This briefing is classified BLUE HADES. If you do not have BLUE HADES clearance, please leave the room now.

"At 0944 this morning, communication with the Witch Bravo oil platform was lost. It was initially believed to be a combination of heavy weather and technical difficulties but when they continued to remain out of touch, Witch Charlie sent a chopper out. It couldn’t land because of high winds but the pilot noted two things.

"Firstly, there were crew moving about on deck. Actually, he said ‘stumbling’. Secondly, the gas flare from the rig was green.

"At 1602, a rescue boat from the coast guard made contact with the platform. The last transmission we got from them was, ‘Oh fuck, they’ve got glowing eyes’.

"Witch Bravo is right on the edge of an area designated in the Benthic Treaty as forbidden to humanity. Without wishing to prejudice your findings, it is entirely possible that some moron has drilled into Cthulhu’s arse-crack. If that's the case, then your job is to plug it.

"But first, a word from Health & Safety..."

A Laundry Files adventure from Black Bag Jobs. A full briefing is available here.