Post #2216 by WendyBG on the Macroeconomic Trends and Risks board

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https://www.popsci.com/environment/yellow-robot-su...

Self-piloting submarine set to begin historic mission to circle Earth’s oceans No one lives on this yellow submarine. Andrew Paul, Popular Science, Published Oct 10, 2025 An autonomous submersible named Redwing is heading out on a truly historic voyage. If successful, it will achieve the first around-the-world ocean trip made by an unpiloted underwater vehicle.... Redwing—an acronym of the Research and Education Doug Webb Inter-National Glider—isn’t powered by propellers like other submersibles, but uses an energy-saving buoyancy system instead. The configuration allows it to sink to a depth as low as 3,280 feet before rising once again on the ocean currents. Redwing isn’t setting any speed records, however. On average it will travel at around 1 knot (1.15 mph) while maxing out at 2 knots (2.3 mph).... The bright yellow craft is equipped with a sensor designed to measure three data points during its thousands of miles of sailing—its depth, as well as the surrounding water’s salinity and warmth. The information will then relay its measurements to the mission team by satellite every 8 to 12 hours as it resurfaces. Redwing is also carrying a fish tracker that will flag any nearby tagged species during its travels.... All that information can provide oceanographers with a three-dimensional glimpse of portions of the planet human eyes have never seen. The discoveries could also aid in meteorological efforts like monitoring ocean heat waves, hurricane intensity, and the health of marine ecosystems.... [end quote]

I think this is very neat. But I just don't get it. How does the propulsion system work? The mission is supposed to last 5 years with occasional stops but it doesn't mention any kind of power source.

Wendy

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