Water...what is it about bodies of water, and ghosts? Maybe it's that some truly horrible things have happened in and around water.
This episode starts small...and finishes with a most popular and well known tale.
Japanese Ghost Stories: Himeji Castle and Okiku's Well - (thewillowweb.com)
(1) Aunt Julia in Ruddock : nosleep (reddit.com)
Truk Lagoon: The Haunting WWII Graveyard Under The Sea (allthatsinteresting.com)