As rivers re-open to shipping, oil threat to Bangladesh's Sundarbans forest continues Resource Type: Article Published: 2015 Bangladesh's Sundarbans forest, home of incredibly rich biodiversity, is under unprecedented threat, writes ASMG Kibria. The recent oil tanker capsize on the Shela river puts the forest at risk of widespread biodiversity loss, but just this week, the authorities re-opened the Shela river to shipping with no restrictions on hazardous cargoes.