Haunted Mansion

High-altitude freshwater sunken tree dive with ghostly algae.

Shore Access
8m Avg Depth
17m Max Depth

About this dive site

This dive site, known as the 'Haunted Mansion' at Lake Motosu, Japan, is a unique freshwater dive site centered around a massive sunken tree. Entangled algae give the submerged tree a ghostly, mansion-like appearance underwater. Located at 900m altitude, it demands special attention to buoyancy control and adherence to high-altitude diving protocols. The site is primarily known for its distinctive underwater topography, dominated by this singular, large natural structure and its eerie ambiance. The freshwater ecosystem of Haunted Mansion is home to a variety of marine life. Divers can expect to see black bass, catfish, crocodilefish, ayu, wakasagi, carp, Japanese carp, sculpin, and threadfin bream. The site is particularly noted for its macro life, including various nudibranchs, which can be found amongst the sunken trees and aquatic plants. The best time to visit Haunted Mansion would likely be during warmer months for more comfortable diving conditions, though specific seasonal highlights are not detailed. Divers must be prepared for high-altitude diving, which includes adjusting dive computers and tables, and exercising precise buoyancy control due to the reduced atmospheric pressure. Its relatively shallow maximum depth of 17 meters and average depth of 8 meters make it accessible and appealing for both scuba divers and freedivers seeking a unique freshwater ecosystem experience.
Diving Freediving Snorkeling

Site Ratings

Big Marine Life Good
Macro Marine Life Very Good
Landscape Quality Very Good
Water Visibility Good Viz

Plan Your Visit

freshwaterhigh altitudesunken treemacro photographyunique landscapeintermediate friendlybuoyancy control

Marine Life

catfishJapanese carpwakasagithreadfin breamsculpinblack basscarpcrocodilefishayunudibranchs

Things to Note

Difficulty:

Intermediate

High-altitude diving requires special buoyancy control and gas management, making it intermediate.

Hazards:
high altitudecold water
Current Strength:

Mild

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