five o'clock
She was safe enough to come and go from the passage entrance to the nearby furnace Grenville had moved to facilitate her duties , but the smoke seemed far more stifling and hot than it had the previous day , while , with headache , thirst , and a heaviness in all her weary being , the endlessly cheerful and courageous little companion of Grenville 's maddening ordeal felt ready to drop and rise no more . Again at his task of constructing a float that should bear him from the cavern to the inlet formed by the spring , Sidney toiled with no mercy to himself in the workshop far down in the rocks . He felt at times he must gulp down even the water of the sea , so parched was his throat , and so craving was his system . At five o'clock his bamboo raft was completed , even with braces for his jugs . It had also been tried in the basin of the cave , and made finally ready for launching . But the tide would be low till eight . His blast had made the water more approachable than formerly , yet to fight his way against a powerful current would over-tax his strength .