Rescuers in Laos say they are investigating a possible “knocking response” deep inside a flooded cave network where two men are believed to remain trapped.

Hungry and weak, the Laos cave survivors huddled together in damp darkness for 11 days, clinging to hope as a wall of water blocked their way out.

Rescuers in Laos say they are investigating a possible “knocking response” deep inside a flooded cave network where two men are believed to remain trapped.

Rescuers in Laos are racing against time as they investigate a possible “knocking response” deep inside a flooded cave network, where two men are believed to remain trapped days…

Rescue workers searching flooded caves in Laos reported hearing "a knocking sound" from inside the system as they sought to extricate two people.

Rescuers are investigating a possible "knocking response" deep inside a flooded cave network, where two men are believed to remain trapped days after five escaped.

Rescuers in central Laos are racing to find two men feared to be trapped in a flooded cave network for almost two weeks, as storms batter the dense jungle.