si-tä seuras-i use-i-ta voimakka-i-ta räjähdyks-i-ä luol-i-ssa .
it-PAR follow-PST.3SG several-PL-PAR powerful-PL-PAR explosion-PL-PAR cave-PL-INE
(First a minor explosion was heard and) it was followed by several powerful explosions in the caves.