The Metro authorities need to get rid of their construction debris, while the Mumbai Port Trust (MbPT) want it for themselves. Now, the port authorities have proposed the perfect solution, so everyone gets what they want. Tonnes of debris from the underground Metro III project are currently being ferried all the way out of the city at great expense, but could soon form the foundation of MbPT's fifth oil berth at Jawahar Dweep or Butcher Island.

The debris from Metro III (Colaba-Bandra-Seepz) is currently ferried as far as 50 km away and dumped in abandoned quarries at Raigad and Thane. According to the MbPT's proposal, this distance could come down to just 10 km, if the Mumbai Metro Rail Corporation (MMRC) were to transport the waste by sea to Butcher Island, where the Port authorities are building a new oil berth and storage unit.