English: Preston Brook tunnel. Taken on a duller day than that by Johnny Essex. The tunnel (1237 yards long) is too narrow to allow two boats to pass. Therefore there is a time control, northbound boats (this direction) being allowed to enter between 00 and 10 past, southbound boats between 30 and 40. It takes about 15-20 minutes to travel through. We had arrive at quarter past so had to wait.
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