Swim along the left side of the moat (as you face the castle) ducking under the stone things. At the end is a hole in the base of the moat, swim along it and you will find a lever. This opens a couple of grates connecting the front moat with the rear moat. Along the rear of the castle you will find a break in the wall, and that lets you in. You can lower the drawbridge from the inside to make coming in and out easier later.
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