Persistent rumours exist of a Ley tunnel which is said to run from Kilwinning Abbey, under the 'Bean Yaird', below the 'Easter Chaumers' and the 'Leddy firs', and then underneath the Garnock and on to Eglinton Castle. No evidence exists for it, although it may be related to the underground burial vault of the Montgomeries which does exist under the old abbey. A ley or an escape tunnel is also said to run from the castle to exit at the old waterfall near the rockery. It is reported that a tunnel ran from the castle to near the existing Castle Bridge. This tunnel was stone lined and tall enough for a man to walk through. This is likely to have been the main drain from the castle.