Explosive
There are always other keywords to denote the type of explosive attack after rolling to hit. (e.g. Frag (n))
When using an Explosive weapon, perform a Shoot action, which must target a cube that is LOS; you do not need to be able to see an individual model in the cube. Make a 3 dice Ranged test (1) with no modifiers or rerolls allowed. If successful, the target cube is hit. If failed, roll to Scatter (refer to Page 28 in the rulebook) to determine which adjacent cube on the same level is hit instead. There is no opposed roll made by the enemy to this Shoot test, but there may be a later damage roll (e.g. Frag (n)). Explosive weapons will not bounce off solid walls, they will affect whichever cube the Scatter roll indicates. If they Scatter off the battlefield they miss completely and have no effect. Now resolve the type of attack on the affected cube using the other keywords