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The Azure Window was a natural arch situated in the west coast of Gozo(Maltese Archipelago) that collapsed in March 2017. We employ a DiverPropulsion Vehicle-mounted camera system to capture data for the 3D-modellingof this collapsed arch via photogrammetry. We demonstrate use of this method todocument complex underwater geomorphology spread across a large area, and drawup a geomorphic assessment of the site and collapse event on the basis of this3D-model. The methodology enables a reconstruction and understanding of thecollapse event. On account of the high-resolution attained, we are able tocross-match the principal submerged components with their pre-collapselocation; this enables an understanding of the dynamics of the collapse,confirmation of rock break-up along existing joints, and mapping thedistribution of the rock and debris from the collapse event. We conclude thatthe key stages in the collapse of the Azure Window entailed erosion at the baseof the pillar, leading to the latter's collapse in the southwest direction,breaking into two main sections that separated along the lithological boundary.We also find clear evidence that separation of some sections of the pillarfollowed pre-existing joints. The bridge collapsed vertically upon loss ofsupport from the pillar, breaking into two main components and many otherfragments. We also document further changes at the site post-collapse. We showthat this approach can be utilised to understand and characterise such eventseven when significant time has elapsed since collapse, and rocks have alreadyundergone erosion and significant marine growth.

Reconstruction of the collapse of the 'Azure Window' natural arch via photogrammetry