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| | The Severn Tunnel |
 | | Until quite modern times the crossing of the Severn estuary had to be made by boat, and the passage was, to a greater or less extent, dependent on the state of the tide. |
 | | This railway, with its ferry piers, was the forerunner of the Severn Tunnel. |
 | | The river bed at the spot was overlaid with large quantities of clay, and pumping operations, which had meanwhile been stopped to prevent the enlargement of the leak by the inrush of water, were resumed without incident. |
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