Four months ago, a 20-ft-deep cavity was detected at Marine Drive, which the Brihanmumbai Municipal Corporation (BMC) was able to repair in time before any accident took place. Acting on rising concerns about the stability of the popular promenade, BMC is now going to carry out a structural audit there, eight years after taking over its maintenance.

Unlike other structural audits, however, BMC is planning to use radar pulses to survey the ground beneath the promenade and detect cavities. The initiative has been taken by the BMC's heritage department and they are currently in the process of appointing a consultant for the job. They have suggested heritage structural consultant Chetan Raikar for the job and are currently waiting for administrative approval. The Marine Drive promenade was handed over to the BMC in 2012. The A ward office has been maintaining it ever since. The survey will be carried out on the 4.5 km-long stretch from NCPA till Girgaon Chowpatty.