[...]... 'Just don't move,' whispered the Doctor He had balanced his hat on the end of the telescopic probe he always carried, and was stealthily inching it up into the air above the edge of the console At once came the shattering whipcrack from above them; the hat flew into the shadows beside the TARDIS and lay smouldering The Doctor stared at it in anguish 'I'm afraid we're trapped again, Harry,' he sighed 'But... internal relay,' said the Doctor, glancing up at one of the instrument displays set into the circular wall 'A what?' Harry looked from the couch to the instrument panel and back to the Doctor 'A short-range Matter Transmitter,' snapped the Doctor, striding back into the main chamber Harry padded after him, still clutching the remains of his shoes 'What on earth does that mean?' 'It means,' called the. .. wisps of wool stuck fast to the floor 'That's impossible, Doctor, and anyway, how could it have got through there?' Harry pointed to the fine-mesh grille set into the base of the inner wall, into which the trail disappeared The Doctor grunted, tracing the silver track across the gallery and up the outer wall where it disappeared into a similar grille set between two of the window panels 'A multi-nucleate... to, he saw the Doctor standing motionless in front of the pallet which was now quiet again The shield was open Harry moved cautiously round the central shaft to avoid the huge crumbling corpse, and padded across the chamber to join the Doctor The pallet was occupied by a dark-haired woman in her thirties, wearing the same simple white uniform with green flashes as the young man Harry had examined earlier... The Doctor leaned across and took a small transparent container from a holder fitted to the inside of the pallet cover Visible inside the container were several coloured spheres, like billiard balls, and a gleaming instrument resembling a spray gun 'I shouldn't have opened the shield,' muttered the Doctor, watching intently as the woman eagerly took out the spray gun, and carefully fitted one of the. .. At the same instant, the Doctor leapt up at the switch; there was a rapid series of cracks, a smell of burning rubber, and then silence After a long pause, the Doctor' s head appeared slowly over the top of the control desk, followed, after another long pause, by Harry's Cautiously they both stood up 'That foxed you,' said the Doctor pulling a face at himself in the mirror surface of the OMDSS He wandered... something 'But surely, Doctor, such an organism would not be capable of moving that fast ' 'Come on,' interrupted the Doctor, 'let's find Sarah first Ah, this looks promising.' He strode towards a panel in the inner wall, a few metres along from the grating As before, he knelt down and rested his forehead against the small plate set into the wall, frowning in profound concentration Nothing happened; the. .. criss-cross of glinting metal tracery reminded Harry of the framework of an airship stood on end The phosphorescent light filling the chamber came from the translucent shields protecting the pallets; each shield was moulded to the contours of the human form As their eyes became accustomed to the alien half-light, the Doctor and Harry discerned the outline of a human body suspended in each alcove In the cold... you think you are doing?' The Doctor had made a complete circuit of the chamber, and come upon Harry examining the pupils of an occupant whose shield he had managed to prise open Harry pointed to the slim, fair-haired young man lying there inert with open, staring eyes He was dressed in a simple white uniform with green identification flashes There was no colour in his face, and his skin was waxen and. .. you saw something moving before,' the Doctor reminded him Harry shivered and looked uneasily around He remembered the Doctor' s reference to giant snails Something caught his eye in one of the pallets in the opposite bay It looked different from the others The Doctor was busy trying to scrape off a sliver of the tacky substance with the probe On tiptoe, his socks still sticking slightly to the floor, Harry . a shoe in each hand, Harry padded over to the opening. The Doctor was standing alone beside the couch. All around, the chamber lights were beginning to flash on the instrument panels, and a. something moving about on the other side of the glass. The soothing voice began again, scarcely audible, and for a moment Sarah imagined that she could hear the Doctor and Harry talking, and. fighting for breath. The voices of the Doctor and Harry in the other chamber gradually receded into the distance ' and judging by that modified version of the Bennet Oscillator,' the