Question juridique clé
Whether the appeal could succeed on the alleged causal link between the 1992 blasting and the cracks.
Solution extraite
The appellant did not show that the cantonal court wrongly denied a proven natural and adequate causal link; the challenge was largely appellatory.
Motifs extraits
The Federal Court was bound by the remand scope and found no reason to disturb the lower court's assessment that causation was not established.