Drifters on the Sea

Homo erectus though reached Bali by trekking over land bridges; but migration beyond Bali required important sea crossings, which could not have occurred by accident. They must have used some sorts of seaworthy vessels. The current theory is that bamboo rafts were used.
Anything that floats could be lashed together to make a raft and serve as a boat. So bamboo, wood logs and reeds must have all been used as raw materials, tied together with vines or palm fibres. During the second half of the...