There isn't the slightest doubt in my mind that you found and got rid of the worst of them.

The officer in charge of the gun-crew agrees with me.
They planted the big ones, the ones that were to destroy the ship, down in the hold, where there was less chance of discovery.

The others, I am convinced, were much smaller.

It would have been impossible to hide a bomb of any noticeable size in any of the places where the explosions occurred.

They went about it very cunningly, very systematically.