Multibeam bathymetry data from the natural bridge (POI 67) located on the outer terrace at 64 m depth near North Rock, displayed and colored by depth in CARIS software subset mode. Images of tunnel clockwise from top left: 1) Plan view of 2m gridded surface model in shaded relief shows the adjacent sand channel and sinkhole features with the position of the vertical profile referenced below seen as the yellow line, 2) down slope view of 3D sounding point cloud showing the upper tunnel entrance, 3) vertical profile slice through the point cloud at the position of the yellow line in view #1 showing both the inshore and offshore entrances of the tunnel. Vertical and horizontal scales are in meters.

Multibeam bathymetry data from the natural bridge (POI 67) located on the outer terrace at 64 m depth near North Rock, displayed and colored by depth in CARIS software subset mode. Images of tunnel clockwise from top left: 1) Plan view of 2m gridded surface model in shaded relief shows the adjacent sand channel and sinkhole features with the position of the vertical profile referenced below seen as the yellow line, 2) down slope view of 3D sounding point cloud showing the upper tunnel entrance, 3) vertical profile slice through the point cloud at the position of the yellow line in view #1 showing both the inshore and offshore entrances of the tunnel. Vertical and horizontal scales are in meters. Image courtesy of Rikk Kvitek, Bermuda Deep Water Caves 2011 Exploration, NOAA-OER.

 

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