This is exactly what happened to my boat. Blew out most of the tranducer,
leaving only a thin layer of plastic to keep the sea out.

"Wayne.B" wrote in message
...
On Fri, 28 Mar 2008 15:24:46 +0100, "Edgar"
wrote:

There are probably thousands of thruhull transducers in use and I have
never
heard of one being punched out

They get punched out by lightning strikes once in a while, as do
knotmeter transducers.