Gaza’s fragile ecosystem could be permanently damaged by a huge influx of salty seawater like that which Israel is considering pumping into the city, experts said. Some of the deepest tunnels dug by Hamas and other militant groups could be near groundwater depths, souring the area’s drinking water.

According to reports in US media on Tuesday, Israel has pushed ahead with plans to flood Gaza City with seawater in an attempt to destroy the network of tunnels dug beneath the city by Palestinian militant groups.

According to the report, the IDF finished assembling five massive seawater pumps north of the Al-Shati refugee camp in the northern Gaza Strip in mid-November. The plan is reportedly to flood the tunnels slowly over several weeks, giving Palestinian fighters and their Israeli captives time to safely evacuate.