The civic body has started putting tetrapods, which were removed for the Coastal Road project, back in its place in Marine Drive after residents complained of ‘tremors’ caused by huge waves during high tides. The Nariman Point Churchgate Citizens Welfare Trust or NPCCA on Saturday raised the matter in a letter to the BMC. It stated that several residents of Shree Niketan and Gobind Mahal societies, sea-facing buildings between G and F Roads, have been noticing vibrations in the structures that “feel like tremors”.