Here's a youtube vid that shows some stills from the 1955 explosion,
Here's a famous bit of footage of a similar type of mine going of the year before, on the first day of the battle of the Somme, at Hawthorn ridge,
There's a commonwealth war grave near the Spanbroekmolen crater in which several of the troops buried there were killed by falling debris after crawling out into no mans land to there jumping off points for the attack.