Hands held and guided the terrier past the outside root. Tarquol tissed again as the dim light darkened with the shape of the enemy, whose scent was on the hair of Tarka's neck. Bite'm whined and yapped, trying to struggle up to the otters. His hind feet slipped off the roots, and he fell into the water below. _Plomp, plomp, plomp_, as he trod water, trying to scramble up the side. Again the opening grew dark with arms holding and guiding another terrier, and Biff began to climb. _Wough! wough! wough!_ Soon she fell into the water. The terriers were called off. Tarka settled more easily, but Tarquol could not rest. Hounds and terriers were gone, but still the voices of men were heard. The sound was low and regular, and Tarka's eyes closed. Tarquol quatted beside him, and for many minutes neither moved. Then the murmur of voices ceased with footfalls along the bank, coming nearer, and stopping above. A man climbed down the bank and slid feet first into the water; the chalky light was reflected in at the opening. An arm was thrust in, and the wrist-jerk sent a handful of small pieces of rock into the holt. The pieces hissed when they met the water, and gave off streams of bubbles. The otters gazed down at them. The man moved away from the holt, and his friends hauled him to the top of the bank. Silence, except for the hissing and bubbling in the holt. The otters were immobile in curiosity. Neither Tarka nor Tarquol thought of the strange bubbling as an act of the man. Often they had seen bubbles arising from the holes of eels and ragworms in mud. Sometimes in solitary underwater play they had blown bubbles, and tried to bite them before they broke at the surface. Tarka and Tarquol moved lower along a root to be nearer the strange bubbles. Tarka was lower than the cub, near the water, when he started and sprang as though trapped, gave a retching cough, and tumbled into the water. Tarquol tissed with fright, gaped when he breathed the acetylene gas, and followed Tarka out of the holt. He saw Tarka's chain rising bright before him. He turned upstream and was alone. Seventy yards from the holt he rose under the bank to rest, and heard the baying of hounds. He dived again and went on upstream at his greatest speed. At his next vent he knew that the terrible beasts were following him. He swam out of the pool, turned back again, saw their heads in the water from bank to bank, became scared, and left the river.