The publication date for issue 289 is the 10th of December, meaning subscribers should receive their copies during the week leading up to that date. It is also available from caving suppliers such as Inglesport and Starless River, or from our new website
This is one of the no-brainer solutions that NASA could have begun developing by the 1980s, had Ronald Reagan not diverted vast finances from moon development and exploration, and put them into the biggest waste of commercial money of all time - the 'Star Wars' laser-weapons project. Which everyone's taking about nowadays. I was six at the time of the first moon-landing, and not unreasonably assumed that by now, I'd be up there! Anyway, that grumble aside, it's a welcome step forward, and the quicker the better. There's a whole sea of titanium ore up there, just waiting to be dug...
The actual Research Letter is entitled "Detection of intact lava tubes at Marius Hills on the Moon by SELENE (Kaguya) Lunar Radar Sounder" in Geophysical Research Letters [ http://onlinelibrary.wiley.com/doi/10.1002/2017GL074998/full ].
Getting back down to Earth, does anyone know of references to radar and gravity readings identifying terrestrial cave locations?