does this mean we don’t need worldwide sonar?

by twit

From the BBC on Feb 8, 2008:

The team which developed the autonomous vehicle say it has covered “thousands of kilometres” during the tests. The team believe the glider – which needs no batteries – could undertake oceanographic surveys for up to six months at a time. “We are tapping a virtually unlimited energy source for propulsion,” said Dave Fratantoni of the Wood’s Hole Oceanographic Institute (WHOi).

https://i2.wp.com/news.bbc.co.uk/nol/shared/spl/hi/pop_ups/08/technology_enl_1202474702/img/laun.jpg

that would be really nice.

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