Chapter Twenty EVERYTHING BOILS UP!
　　Meanwhile the three boys and Timmy were having a strange journey underground. Timmy ledthe way without faltering¹, stopping every now and again for the others to catch up with him. Thetunnel at first had a very low roof and the boys had to walk along in a stooping position, whichwas very tiring indeed. But after a bit the roof became higher and Julian, flashing his torchround, saw that the walls and floor, instead of being made of soil, were now made of rock. Hetried to reckon out where they were.
　　'We've come practically straight towards the cliff,' he said to Dick. 'That's allowing for a fewturns and twists. The tunnel has sloped down so steeply the last few hundred yards that I thinkwe must be very far underground indeed.'
　　It was not until the boys heard the curious booming noise that George had heard in the caves,that they knew they must be under the rocky bed of the sea. They were walking under the sea toKirrin Island. How strange, how unbelievably astonishing!
　　'It's like a peculiarly vivid dream,' said Julian. 'I'm not sure I like it very much! All right, Tim --we're coming. Hallo - what's this?'
　　They all stopped. Julian flashed his torch ahead and saw a pile of fallen rocks. Timmy hadmanaged to squeeze himself through a hole in them and go through to the other side, but the boyscouldn't.
　　'This is where the spades come in, Martin!' said Dick, cheerfully. 'Take a hand!' By dint² ofpushing and shovelling³, the boys at last managed to move the pile of fallen rocks enough to makea way past.
　　'Thank goodness for the spades!' said Julian.
　　They went on, and were soon very glad of the spades again, to move another heap of rock.
　　Timmy barked impatiently when they kept him waiting. He was very anxious to get back toGeorge.
　　Soon they came to where the tunnel forked into two. But Timmy took the right-hand passagewithout hesitation⁴, and when that one forked into three, he again chose one without stopping tothink for one moment.
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　　'Marvellous, isn't he?' said Julian. 'All done by smell! He's been this way once, so he knows itagain. We should be completely lost under here if we came by ourselves.'
　　Martin was not enjoying this adventure at all. He said very little, but

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