Right, so persons a, b and c are employees at Finsch. Persons a and c are male and work in the same department underground. Person b is female and works elsewhere. Persons a and b are… intimate… and person c is obviously a close mutual friend because on at least one occasion he was present while they were being… intimate… and he had his digital camera with him. One can only assume that it was by mutual consent that the camera, and cameraman for that matter, were present because persons a and c went to work a little early the following day to print some pictures on the high quality colour printer. They logged in, loaded the pictures and hit the print button, probably perusing them briefly before doing so. They then went to collect them and to their horror (at least I would assume they were horrified) the pictures were not there. They waited around for a bit but eventually the time came that they had to go underground and reluctantly (again I assume they were reluctant) they left.
Anyway, the secretary arrived a short while later and, as secretaries do, printed something. When she got to the printer she found that it was off. Cleary persons a and c don’t know much about printers. She turned it on and was rather surprised to find that her document was not the first thing that printed. Unfortunately for persons a and b photos tend to make identification fairly easy. Unfortunately for person b his friends were not going down alone.