Well
Today it was playing time for me. So tired of that Bob Boyce setup, i just took some stuff together.
I removed the resistor of the sparkplug, took my MOT and my variac.
Added a big capacitor and a switching diode.
I was SOO impressed.....

The water was exploding under my eyes!!!!!!!!!
I understand now why some people are investigating this kind of setup.
I have 2 video's for you guys.
1 = sparkplug taking some water when i hold it into water.You hear an enormous loud noice of explotions!!!!!!!!!!!!!!!
2= sparkplug firing underwater. You hear the sound of explosions underwater!!!!!
br
Steve