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There are three basic types of lightning. Cloud to ground, ground to cloud 
and cloud to cloud. As is the case with most lightning strikes, proximity 
plays a great part in how it affects you. If you were in close proximity to 
the strike you would definitely have major problems. As far as a shock wave 
is concerned I doubt seriously that you would experience one under water. 
The sound, or thunder, is a result of rapidly expanding superheated gasses 
expanding at speeds greater than the speed of sound. Water, especially salt 
water is a far superior conductor than air because of this I would expect 
that the water would not become superheated therefore no rapid expansion, 
and no accompanying shock wave. However if you are, as we Electrical 
Engineers are so fond of saying, "part of the CIRCUIT" you will be in a 
world of hurt! I would expect that you will be part of the circuit if you 
are in close proximity to a lightning strike while in the water. ONE SHOULD 
TAKE ALL THE PRECAUTIONS POSSIBLE WHEN IN THE PRESENCE OF ELECTRICAL 
DISCHARGES FROM STORMS....GET OUT OF THE WATER!!!! FAST! If possible do not 
have contact with metal objects that are grounded to the electrical system 
of the boat or with metal objects in contact with the water. Most important 
of all move away from the electrical storm if possible.

Cecil Christopher

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