Were there any tunnel race boats prior to the 1965 - 1966 time frame? If so what were they?

Thank you.

My first experience with a tunnel was Havasu, 1966. Dieter Schultz had just won the Single Engine class. 2 Hours Saturday and 4 Hours Sunday.

My twin engine Glastron had broken early both days, but we stayed til the end of the race.

Dieter's boat liked like a Big Sled. I figured it must have about a 48 inch wide bottom, like a "Floater" and he just flew over the water.

The boat was hooked up to Dieter's car as we were leaving, I told my dad I wanted to look at the boat. My dad was wanating head back to California, but allowed me to get out of the car.

I looked at the transom and to my surprise there was NO BOTTOM. Just two narrow runners that were on like a 45 degree angle. I started yelling for my dad to come and look at this boat with no bottom.

On the way home my dad and I talked, "Like how could a boat do that with no bottom."

That was my introduction to tunnels, November, 1966.