I witnessed such a "BOOM" at Galveston once.
They used to do them of the "T" head at a hotel over the Gulf. When it went off, all at once, you could see workers going off the "T" head into the water about 30 feet below.
BTW---the "explosion" was great fun---no one complained and no one got hurt--even the jumpers were ok, just wet.
Blessings