A sea tractor is like a car that drives on water. It is a special vehicle that can drive through the sea and take people from one place to another without getting wet. The sea tractor has big wheels that help it to move on the sand at the bottom of the sea.
People sit inside the sea tractor, just like they sit inside a car. There is a driver who operates the sea tractor and drives it through the water. The sea tractor can go from the shore into the sea, over the waves and through the water without getting stuck in the sand or the rising tides.
This is very helpful for people who live in places where they need to cross the water to get somewhere, like an island or a remote beach. They can hop inside the sea tractor and ride across the water without needing to swim or use a boat.
So, in summary, a sea tractor is a special vehicle like a car that can drive across the water, through the sea and help people to cross the water safely and easily.