It started recently when I picked up a popular science magazine, Science Illustrated at an airport before getting on an flight for a work-trip. I’d never purchased this magazine before, but an article mentioned on the cover about Homo erectus looked intriguing. The article was titled “Who was Homo erectus,” by Jørn Madsen of the Natural History Museum of Denmark, and it suggested reasonable evidence that Homo erectus built boats and was capable of seafaring over moderate distances of water. . .
Kind of summarizes stone tool finds on isolated islands from various sources that suggest boat crossings. The dating on may of these assemblages is questionable, however.