The fuses were tested and found to work as advertised but I am thinking they did not set one of those devices off for a full test....but if the fuses worked....the rest of it would be quite dependable.
The devices all failed to damage the bridge and no reliable source of information exists to confirm what happened to them.
Various articles talked about shallow water, variable current flow, mud bars.....etc for reasons they did not. go off under the bridge as planned.....and at such an awful cost in lives due to the second mission.