Experimenting on a raft anchored on the river Elbe, Alfred Nobel tries to make nitroglycerine safer to handle. Finds that the addition of kieselguhr turns nitroglycerine into a dough that can be kneaded, and calls it "dynamite".
Experimenting with explosives is best done when safety is considered and the location is in an area separated from people and things that can be damaged. 
The experiments were done on a raft in a river to get away from everyone and everything. 
( z1 good :ARG1 ( z2 experiment :ARG1 ( z3 explosive ) ) :time ( z4 and :op ( z5 consider :ARG1 ( z6 safe ) ) :op ( z7 be-located-at :ARG1 ( z8 location ) :ARG2 ( z9 area :ARG1-of ( z10 separate :ARG2 ( z11 and :op ( z12 person ) :op ( z13 thing :ARG1-of ( z14 damage :ARG1-of ( z15 possible ) ) ) ) ) ) ) ) )