Rescuers at the Hell's Abyss.

Rangers reinforced barriers in “Hell’s Abyss,” Thai waterfall, after five more dead elephants were found at the bottom.

Drones were used to make the latest grim discovery at the waterfall in Khao Yai National Park, bringing the number of elephants who fell to their deaths in the disaster to 11 after six bodies were found over the weekend.

Safety measures are being beefed up at the park around 120 kilometers (70 miles) northeast of Bangkok, where officials are helping create more water and food sources nearby to discourage other elephants from returning to the deadly spot.

Only two survived, they did not fall, but found themselves trapped on a thin, slippery sliver of rock above the churning waters.

For now the Department of National Parks has installed a net to catch the carcasses when the current pushes them downstream.

Elephants are Thailand's national animal but numbers in the wild have dwindled to only a few thousand due to deforestation and habitat loss.

Agence France-Presse.