Castle's Waterway

, also known as the Underground Waterway, is a location in.

Features and Overview
After TPHD: is gravely injured by TPHD:, and TPHD: must go through the TPHD: to take the dying TPHD: to TPHD:. He enters them through a secret passageway from TPHD:, which leads to TPHD: and then to the TPHD:. The TPHD: connects to the TPHD:.

Once TPHD: reaches TPHD: for the second time, he will be unable to return to the TPHD: again.