44 Book ot Engineering 



another. By real hard work they worked 

 their way through, and when the imprisoned 

 men had began to lose all hope of rescue 

 the boat reached them, and a few at a time 

 were carried to the shaft until every fellow 

 had been safely landed. 



It was necessary to employ divers to 

 enter the workings and close certain valves. 

 This again was a very hazardous under- 

 taking, because the workings were cumbered 

 with hastily dropped tools and floating 

 timber. 



Lambert, a diver who had many surprising 

 and dangerous adventures in sunken ships, 

 never had a more onerous task than this he 

 undertook below the Severn. And, owing 

 to a mistake in his instructions, he had to 

 make a double trip, the second being under- 

 taken with a new self-contained diving dress 

 which enabled the air tube to be dispensed 

 with. 



Many years were spent in the construction 

 of this magnificent tunnel, and when it was 

 opened in 1887 it was agreed on all hands 

 that no greater engineering feat had ever 



