To the right of the Mill. To cross, use the hovercraft (hover board).
(see related question)
It goes to the mud swamp, which is the only place that you can use it.
the swamp is past the wind mill in the mud
The saucer Excalibur is crashed in the mud swamp to the right of the Mill.
You can cross the mud swamp on Astro Knights Island by using the Hover Boots. These boots will allow you to move across the mud without sinking. You can find the Hover Boots in the Factory area of the island.
The saucer Excalibur, one of the attacking craft, has crashed in the mud swamp to the right of the Mill.
It is half-buried in the mud swamp right of the mill. (see related questions)
There is no such power. You can fly on the hovercraft into the mud swamp, and in space aboard the Astro Zone ships. (see related questions)
The mill is out of commission. The only way to get across the mud swamp is the hovercraft in the mill's attic.
There is no helicopter. There is a hover board in the attic of the mill that will get you across the mud swamp. (see related question)
Go to the mud and you'll find it there. As soon as you fuel it, it stays right there in the swamp.
Reach and repair the saucer Excalibur in the mud swamp past the mill. (see related questions)
The hovercraft will carry you over the mud swamp to reach the crashed saucer Excalibur. (see related question)