Vast reservoirs of underground ice on the Red Planet and other exciting discoveries by Mars Odyssey will be reviewed in Honolulu this week by the team that developed the spacecraft’s key instrument. “We were really surprised at just how much ice was buried just inches beneath the surface,” William Boynton, of the University of Arizona Lunar and Planetary Institute, said in an interview here. Mars Odyssey was launched by NASA on April 7 last year and is operated by the Jet Propulsion Laboratory. It carries a Gamma Ray Spectrometer — three instruments in one — designed to analyze the chemical composition of Mars’ surface and detect water at shallow depths.