Hundreds of Everest hopefuls are waiting at base camp as glacier blocks route to summit

By Jessie Yeung, CNN (CNN) — Anxiety is growing at Everest Base Camp, more than 5,300 meters above sea level. Hundreds of climbers and sherpas have gathered, eager to summit the world’s most famous mountain as the annual spring climbing season kicks off – but there’s one problem. A massive serac, or a block of