The 3D topography of the SYBH and underwater photography revealed two large transitions at ~76 to 78 mbsl and at 158 mbsl, indicating that the initiation of the blue hole was likely a step wise process and that the hole wall morphology was subsequently remolded through a paleo-sea level stillstand (at or near Younger Dryas). The cave entrance is shaped like a comma and has an average width of 130 m the widest part is 162.3 m wide, while the narrowest part is 26.2 m wide and is at 279 mbsl (meters below sea level). The cave bottom laterally deviates from its entrance by 118 m at an azimuth of 219 degrees. The observed deepest portion of the SYBH is at 301.19 m below the local 10-year mean sea level. The SYBH resembles a ballet dancer’s shoe and has a volume of ~499609 m 3. A comprehensive investigation of the SYBH was carried out for the first time in 2017 using a professional-grade underwater remotely operated vehicle (ROV) to obtain accurate depth and three-dimensional (3D) topographic data. Study of the SYBH can provide insight into the interactions between hole wall morphology and many geological/hydrological mechanisms. The Sansha Yongle Blue Hole (SYBH) is the deepest blue hole found anywhere to date.
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