The low-lying areas of the Sundarbans in Bagerhat district have been inundated due to the tidal surge caused by the depression in the Bay of Bengal. Most of the areas including Karamjal Wildlife Breeding centre have been experiencing a waist-deep-water on Sunday, causing immense sufferings to the visitors. The residents of the coastal areas in Bagerhat district have been experiencing intermittent showers from Saturday afternoon. The water level of many rivers in the Sundarbans also increased. Amresh Chandra Dhali, officer-in-charge of Mongla Weather Observatory Centre, said the well-marked low over the Bay intensified into a depression, prompting the authorities concerned to ask the maritime ports across the country to keep hoisted local cautionary signal No 3.