Betonamit is the product if you need to remove large boulders without the use of exposives

BETONAMIT is a non-explosive cracking agent for noiseless vibrationless demolition without flyrock. It is supplied as a powder. 

Betonamit can be used inside buildings, outdoors, under water and everywhere that large demolition machinery cannot be used.
Betonamit is available from Everitt Site Supplies.