Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Las Médulas' has mentioned 'Water' in the following places:
Occurrence Sentence Text Source
[3][4] The technique employed was a type of hydraulic mining which involved undermining a mountain with large quantities of water.
The water was supplied by interbasin transfer.
Opencast methods would be pursued by fire-setting, which involved building fires against the rock and quenching with water.
The weakened rock could then be attacked mechanically and the debris swept away by waves of water.