This "Siedarc" system seems to be designed to specifically address the "side-arcing" that occurs with a lightning
strike. Although the bulk of the energy most likely passes directly through your mast
to your lightning
ground system underwater, there is a large enough "side-charge" or the part that makes the "blue corona" hanging around to do havoc to your sensitive electronics
- - The blowing holes in the side of the hull
is most likely due to the energy heating
defects or trapped water
in the composite and it blowing a hole. But anyway the "spark-gap" design of the Siedarc is, according to the literature, supposed to allow a path for the residual energy to jump to the sea water's surface. Very interesting. . .