At Offington, near Worthing, an old seat of the Delawarrs, a blocked-up passage, which can only be approached from the cellars, is still believed to communicate with the encampment on Cisbury Hill, and to be full of buried treasures. Some years ago there was a story current of the then occupier of the house having offered half the money to be found there to anybody who would clear out the subterranean passage, and that several persons had begun digging, but had all been driven back by large snakes springing at them with open mouths and angry hisses.
From ‘Some West Sussex Superstitions Lingering in 1868’ by Charlotte Latham, in ‘The Folk-Lore Record’ Vol. 1. (1878), p16.