From what I've read, there was some concern that when the lowest bomb in the stick of 35 dropped from Victor B1A XH648 by Flt Lt Thomson's crew over Song Song range (to send a clear message to the Indons...) detonated, it might set off the next...and that would continue progressively up the stick. At which point the highest bomb would still be rather close the bomber...
This was because the release interval had been set to a short value, making the release photo look impressive whilst ensuring that all 35 bombs remained within the Danger Area!
No-one let slip this piece of gen to those observing the drop...
