As I have pointed out in the not too distant past, for ordnance exploding in air and within a certain height appropriate to the blast, there is now a pattern of shrapnel hits on the surface under the explosion. Over land the hits are dust puffs, and over water there are small splashes. Here a pair of RS82 rockets have just exploded over a river, within about 10-15m of the surface. You can see my I-15 in the distance, with the smoke trails for the 1-second burn still well seen. I was testing out changes to the detonation delay in the weapon class, and here the interval between firing and bursting is 5.5 seconds.