RULE IN RYLANDS v FLETCHER (1866)

The occupier of land who brings or keeps upon it anything liable to do damage if it escapes, is bound at his peril to prevent its escape and is liable for all the natural and probable consequences of its escape even if the occupier has not been negligent. The rule only applies so as to make liability absolute where bringing the deleterious thing onto the land or keeping it there is a non natural use of the land.

See natural user

Exceptions to the rule are:
See liability for fire