Solid still! Tap again.

Holloa! Hollow! Tap again, persevering.

Solid in hollow! Tap, tap, tap, to try it better.

Solid in hollow; and inside solid, hollow again! There you are! Old 'un crumbled away in stone coffin, in vault!' 'Astonishing!' 'I have even done this,' says Durdles, drawing out his two-foot rule (Deputy meanwhile skirmishing nearer, as suspecting that Treasure may be about to be discovered, which may somehow lead to his own enrichment, and the delicious treat of the discoverers being hanged by the neck, on his evidence, until they are dead).

'Say that hammer of mine's a wall--my work.