AFTER a gruelling 11 hour wait, the second substance found in the Leschenault Estuary in Australind has been detonated.
The Australian Defence Force navy divers spent the day searching the area around the jetty.
A police spokesman told the Bunbury Mail the navy had to consider whether to move the substance on land before detonating it, move it to a safer place in the water, or detonate it in the water in its primary position.
After digging a trench and releasing the WA Police Bomb Squad robot, the Navy decided option three was the safest.
At 4.57pm, without warning, the Navy detonated the substance.
Smoke and a water spout of about six metres shot into air, followed by a single loud bang.
More than 20 cars of curious residents lined up along the estuary to have a glimpse of the explosion.