Above the exposed section of wall that was certainly the top of th rear side wall of the chamber, he found the electrical conduits. Thert were fifteen of them laid side by side. Some had been there a ion time, while others were obviously new additions.
It took him a while to isolate the conduit that led down to th chamber below, but when he unscrewed the joint in it, he recognizec the coded wiring of the wall-socket that it contained. His relief was intense. He had anticipated a number of problems that he might have encountered at this stage, but now it would be a simple matter to get his own wire into the roofi He uncoiled the long flexible electrician's spring that he had brought from his tools and fed the end of it into the open conduit tubing until he felt it encounter resistance. Then he began the tedious journey back through the roof, down the step-ladder, along the passage, down the staircase and into the chamber.
He found the end of the electrician's spring protruding from the open wall-socket, and he attached the end of the coil of light detonator wire to it and laid out the rest of the wire so that it would feed smoothly into the conduit when he drew the spring in from the other end.
Back in the roof he recovered the spring and the end of the wire came up with it. Gently he drew in the rest of it, working overhand like a fisherman recovering his handline until it came up firmly against the knot that held the far end to the bench in the chamber below. He coiled the wire neatly and left it, while he returned to the chamber. By this time his overalls were filthy with dust and cobwebs.
He untied the loose end .of the wire from the bench and laid it out on the floor, leading it to the 'pack of plastic explosive under the front bench, making certain he had given himself sufficient slack.
Then he worked carefully to conceal' the exposed wire from casual detection. He threaded it under the green wall-to-wall carpeting and stapled it securely to the underside of the government benches. He filed a notch in the enamelled metal plate that covered the wallsocket and laid the wire into it while he screwed the cover back into place.
Then he went carefully over the floor and carpet to make certain he had left no trace of his work. Apart from the few inches of unobtrusive wire protruding from the wall socket, there was nothing to betray his preparations and he sat on Dr Verwoerd's bench to rest for a few minutes before beginning the final phase. He returned upstairs.
The most difficult and frustrating part of the entire job was placing himself in the roof directly above Shasa's office. Three times he had to climb down the ladder into the toilet and then pace out the angles of the passages and the exact location of the office suite before once more climbing back into the ceiling and attempting to follow the same route through the dust and the roof timbers.
Finally he was sure he was in the correct position and gingerly he bored a small hole through the ceiling between his feet. Light came up through the hole, but even when he knelt and placed his eye to the aperture, it was too small to see what lay below. He enlarged it slightly, but he still could see nothing, and yet again he had to make the journey back to the trap door and along the passage to Shasa's office.
Immediately he let himself into the office he saw that he had misjudged. The hole he had bored through the ceiling was directly above the desk, and in enlarging it he had cracked the plaster and dislodged a few fragments which had fallen on to the desk top. He realized that this could be a serious mistake. The hole was not large, but the network of hair cracks around it would be apparent to anyone studying the ceiling.
He thought about trying to cover or repair the damage, .but knew that he would only aggravate it. He brushed the white crumbs of plaster off the desk, but this was all he could do. He would have to take comfort in the unlikelihood that anybody would look at the ceiling, and even if they did, that they would think nothing of the minute blemish. Angrily aware of his mistake, he did what he should have done originally and bored the next hole from below, standing on one of the bookshelves to reach the ceiling. Between the window drapes and the edge of the bookshelves, the hole was almost invisible to any but the most painstaking inspection. He went up into the roof and paid the end of the wire down through the second hole. When he returned to the office he found it dangling down the wall, the end of it lying in a tangle on the carpet in the'corner.
He gathered and coiled the end and tucked it carefully behind the row of Encyclopaedia Britannica on the top shelf and then arranged the window drapes to cover the two or three inches that were visible protruding from the puncture in the ceiling. Once again he cleaned up, going over the shelf and floor for the last speck of plaster, and then, still not satisfied, returning to the desk. Another tiny crumb of white plaster had fallen and he wetted his finger with saliva and picked it up. Then he polished the desk top with his sleeve.
He left the office through the panel door, and went back over everything he had done. He closed the trap door in the roof of the toilet and brushed up the dust that he had dislodged. He replaced the cleaner's ladder in the closet and then returned for the last time to the chamber.
At last he was ready to wire up the detonator. He removed the wire safety device and switched the detonator on. He bored a hole in the soft centre block of explosive and placed the detonator into it.
He taped it firmly in place, and then scraped the last inch of insulation from the gleaming copper wire and screwed that into the connector in the end of the black cylindrical detonator and crawled out from under the bench.
He gathered up his tools, made one last thorough check for any tell-tale evidence, and then satisfied at last, he left the chamber, locking the main doors behind him and carefully polishing his sweaty fingerprints from the gleaming brass. Then he let himself into the janitor's office and switched on the current at the mains.
He retreated up the stairs for the last time and locked himself in Shasa's office before he checked his wristwatch. It was almost half past four. It had taken him all day, but he had worked with special care and he was well satisfied as he slumped down on the sofa. The strain on his nerves and the unremitting need for total concentration had been more wearying than any physical endeavour.
He rested awhile before repacking the altar chest. He stuffed his dirty overalls into the empty explosives compartment and placed the transmitter on top of them where he could reach it quickly. It would be a few minutes' work to retrieve it, connect it to the loose wire that was concealed behind the row of encyclopaedia, close the circuit and fire the detonator in the chamber below. He had calculated that Shasa's office was far enough from the centre of the blast, and that there were sufficient walls and cast concrete slabs between to cushion the effects of the explosion and ensure his own survival, but the chamber itself would be totally devastated. A good day's work indeed, and as the light in the room faded, he settled down on the sofa and pulled the blanket up over his shoulders.
At dawn he roused himself and made one last check of the office, glancing ruefully up at the insignificant spider-web of cracks in the ceiling. He gathered up his packages, then he let himself out through the panel door and went to the men's toilet.
He washed and shaved in one of the basins. Tara had provided a razor and hand towel in the packet of food. Then he donned his chauffeur's jacket and cap and locked himself in one of the toilets.
He could not wait in Shasa's office for Tricia would come in at nine o'clock, nor could he leave until the House activity was in full swing and he could pass out through the front doors unremarked.