In collaboration with the Institute of Earth Sciences at Heidelberg University, the 3DGeo group reconstructed underwater speleothems in a cave in Yucatán, Mexico. The so-called “Hells Bells” are fascinating formations in several sinkholes, at the boundary layer between fresh- and saltwater.
The full 3D mesh model obtained from several thousand photographs taken by a professional cave diver and underwater photographer can be interactively viewed and downloaded from heidICON: https://heidicon.ub.uni-heidelberg.de/detail/1264341
More information on the Hells Bells can be found in the dissertation of Dr. Simon Ritter:
Ritter, S. M. (2020): Unravelling the formation of Hells Bells: underwater speleothems from the Yucatán Peninsula in Mexico, Dissertation, Universität Heidelberg. doi:10.11588/heidok.00027813