Laos cave rescuers investigating ‘knocking response’ as focus shifts to newly discovered cave shaft

CNN By Rebecca Wright, Kocha Olarn, Angie Puranasamriddhi, June Jeong, Laura Sharman, CNN Vientiane, Laos (CNN) — 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 days after one was rescued and four others crawled to freedom. The development