They get down on their knees and enter the tunnel. A very storong musty smell fills their lungs and they find it very hard not to breath. As they crawl on the tunnle looks more new and the musty smell vanishes.
"We must have entered the castle grounds."
You come across a ladder and climb up what has to be at least two stories. As the tunnel becomes horizontal again in splits in two ways. Thanato's voice is coming from the right and the Scorpian Army Boss's voice is coming from the left. You go......

Right.
Left