Tonbridge Priory tunnels from the Castle????

A lady just came into my shop to ask about the framed print in the window. It's a hand coloured 1735 print of Tonbridge Priory and it's just reminded me of this mostly forgotten part of the history of the town. For those who don't know the Priory stood for around 750 years on the area roughly between the Sainsbury's petrol station and the railway tracks; of course I don't think Mr. J. Sainsbury's ancestors had set up shop yet in the year 1100 and certainly the railway hadn't been thought of! All that's left of it now though, of course, are a few clues in street names such as Priory Road, Priory Street, St. Augustine's old people's home, Priory Vetinary Clinic etc. The most intriguing part of it's history for me is the bit we don't know, the bit that's just folklore and rumour. I read a book a few years back called Tonbridge Legends, written in about 1890, which has a short tale in it about a man, fuelled by drunken bravardo talk in a nearby hostelry, discovering tunnels under the castle and finding some treasure and also something so unspeakably horrific that he had to leave town right there and then, never to return. But surely that was just a made up tale with no grain of truth in it whatsoever. Wasn't it? Then I read an old guide to Tunbridge Wells, compiled in 1814, with a section on Tonbridge, or 'Tunbridge' as it then was, in it. In this section, written some 76 years earlier than Legends, it too mentions the folklore about tunnels running from the Castle to the Priory. I quote: "It is said, that there was a subterraneous passage carried under the bed of the river, from the priory to the castle, in order to supply the garrison with the necessaries in the time of distress; but I can find no warrant for this report except the uncertain voice of tradition."  That's all it says and clearly it's by no means conclusive but, nevertheless the seeds were sown in my mind that there might, just might be something in these tales. It's so frustrating that there doesn't seem to be anything else about it in any other books on Tonbridge; certainly there hasn't been in any that I've read and, believe you me, I've searched them. When I wrote the Tonbridge Community column for the Courier I mentioned this same story and, afterwards, a number of people came forward with their own version of the legend and tales of other secret tunnels emanating from the castle.  Can anyone throw any light on this lovely Tonbridge mystery....