Lorelei is the name of Louise Chatham's boat. Apparently it was in very good shape in the past as time grew on however Louise Chatham mainly kept her boat in the marina and used it as her home.
However, Miss Chatham's boat apparently caused Zane Bennett trouble in the past from boat scratches and dints. It got to a point where Zane Bennett took drastic action as revenge on Louise Chatham in "Shipwrecked" when he got the harbor master involved.
The harbor master inspected her boat and found it un-seaworthy, as it had rot in its structural frame work. In the night Louise Chatham snuck on board the Lorelei and sailed away.
The next day, Zane Bennett noticed that this jet ski had been damaged again, and set out to find Miss Chatham. Zane talked with Miss Chatham and accidentally made her have a heart attack. Unsure what to do, Zane waited till Lewis and Emma arrived and took Miss Chatham to the hospital. Zane stayed on-board the Lorelei to look for her treasure.
However, Zane accidentally knocked a lamp, which contained oil. The oil began to drip onto the boats hot engine and caused a big explosion. Emma and Lewis saw the explosion and Emma dived into the ocean, to save him.
The Lorelei started to sink and Emma managed to save Zane from drowning. However, Zane began to black out, but just before he did, he caught a sight of Emma's tail, which led him to his great "Mermaid Chase" and him aided Dr. Linda Denman in capturing the girls later.