https://www.hindustantimes.com/mumbai-news/study-reveals-decline-in-noise-levelsin-indian-ocean-region-during-lockdown/story-KZyDAXX19LuGM9FXjXYQ3H.html

A slump in shipping traffic during the lockdown has resulted in a marked decline in noise levels across the Indian Ocean Region (IOR) – which includes Arabian Sea, Bay of Bengal and the Indian
Ocean – a study by Pune’s Maritime Research Centre (MRC) has revealed.
The average noise levels in IOR fell from 103.6 decibels (dB) during March to 73.4 dB in May, revealed the study conducted by MRC along with the Foundation for Underwater Domain Awareness, a non-governmental organisation working on marine ecosystem concerns due to acoustic habitat degradation.