It seems that some Dutch explosive ordnance disposal specialists were called in to remove a World War II-era Panzerfaust rocket. It was designed as a single-shot, disposable anti-tank weapon, similar to (but reportedly much more effective than) the US Bazooka or the British PIAT. The image below, courtesy of Wikipedia, shows a Panzerfaust being prepared for firing.
The EOD guys decided to see whether the old, rusted-up rocket would still be effective; so they propped it up against the turret of an obsolete 1950's vintage M48 Patton tank that was being used as a target on a military artillery range. Note that the M48's armor (as with most 1950's tanks) was still basically the same type as that used during World War II, although perhaps a little thicker and better sloped. Here's how the salvaged rocket looked prior to its detonation.
You'll find a slow-motion video of the explosion at Reddit. Here's a screen capture of how it looked.
And here's a photograph of how the shaped charge of the rocket burned through the solid armor of the turret.
It doesn't take much imagination to figure out what would have happened to the crew inside, had there been one. All that molten metal and spall flying around inside would have reduced them to charred hamburger. More than 75 years after it was made, that rocket was still as lethal as ever.
Of course, any tank of that era was under-armored compared to the much more modern anti-tank weapons of later generations. For example, here's a Soviet T-54/T-55 series tank, of similar vintage to the M-48, that met up with a first-generation South African ZT3 missile in Angola in the 1980's. There's not much left of it.
I saw that particular wreck in person. Needless to say, nobody got out of it alive.