Underwater blasting In underwater blasting using NONEL MS it is recommended that two detonators are used in each hole. The tubes from the detonators are connected to Îľclip 0 above the water surface, preferrably on floats of polystyrene or similar. To secure initiation in underwater blasting, the initiation should be done via 2 trunklines.
Underwater rounds may also be initiated by a 5 g/m detonating cord. A minimum of 5 to a maximum of 20 NONEL tubes are collected into a bunch and then taped together. The detonating cord is tied around the bunch with a clove hitch. Alternatively a bunch connector with SnapLine block can be used. See pages 35 and 37. The bunches should have a distance of at least 0.5 m between each other to avoid the risk of cutoffs of tubes.