Run silent, run green

摘要

Something unusual is swimming in the sea near the United States Virgin Islands. It has been there since December, slowly criss-crossing the 65km between St Croix and St Thomas, periodically surfacing and then diving back down again to depths of 4,000 metres. It is likely to keep this up for another three or four months. It is not some strange aquatic creature, but a new robotic underwater vehicle that could revolutionise the way oceans are studied.