The Soviet “sea monster” is back – and this time it’s for sale. A Chinese company has completed the maiden flight of a passenger craft that skims just above the water’s surface using ground-effect technology, reviving a concept once associated with the Soviet Union’s giant Cold War-era experimental vehicles. Chinese mobility company Navee on Thursday showcased its WaveFly 5X on Lake Taihu in Suzhou, eastern Jiangsu province, as it raced to commercialise what it said was the world’s first...