In the weeks running up to the summit, Nick Clegg had worked very hard behind the scenes to try to find a navigable passage.....

There's only one "navigable passage" that Cameron is interested in - the one that Clegg bends over and offers him regularly.

Within a few hours, the Southern Star would be steaming through one of the navigable passages that pierced the reef, guided by a pilot who would know the hidden channel.

He said that he was studying navigable passages.

The place dates back to 1135 when it was known as Santflit, meaning "a navigable passage through sand".

Its lagoon is wide and deep with one navigable passage.

In the summer of 1823 Parry abandoned hope of finding a navigable passage through Hudson Bay and returned home.

Each lock has a navigable passage next to it through the weir, which is opened during periods of high river flow, when there is too much water for the lock.

The broad reef completely encloses the lagoon, so that there is no navigable passage to enter it.

An incomplete examination by the Sylvia showed it to be a fine navigable passage, but no anchorages were found.