The lone figure trudged across the Hellas Desert toward Alpheus Canal. He moved fast in the low gravity of Mars, but the canal was miles away and the afternoon was far gone. Robbo Shaan turned his marsuit temperature unit down a degree. He still perspired freely, but he didn't dare turn it any lower. Only a green Earthand would ignore any survival factor when stranded on the Martian desert. Shaan had no map, no compass. But he remembered there was a private dome in the middle of the canal, just