Rescue workers in Indonesia have pulled a survivor out of rubble left by Monday's huge earthquake off the coast of Sumatra.

A crew of rescuers from Singapore and Mexico dug for seven hours Saturday to free the man from his collapsed three-story house on Nias island, one of the areas hardest hit by the 8.7 magnitude quake.

The man, named Hendra was found after he was heard calling for help and water. The extent of his injuries is unknown.

He was discovered after the search for earthquake survivors had already been halted. Indonesian authorities said they expected to find no one alive more than four days after the devastating jolt.

Restoring basic services and shelter for thousands of people whose homes were lost in the quake is now the focus of relief efforts. Water and food are still in short supply in the islands off Sumatra, and bad weather and aftershocks are hampering aid workers.

Some information for this report provided by AFP and AP.