the moon over fifty years ago would not do: there, an object has only one-sixth of its Earth weight; on Mars, it weighs double its moon weight, and therefore any carrier must be heavier and more powerful. A wheeled vehicle would have been much lighter, but we were opposed to that for use on an unknown terrain. A platform could skim safely above any kind of surface, and my father had supported us. In the end, he had designed a suitable platform in three sections which were dispatched to Primeira to be stowed aboard the Figurao when she called there. Thus, for the main lift we had been spared the weight of the biggest single piece of equipment that we carried, and could simply jettison it on Mars when we took off for the return.
I found the three main sections, even at their Martian weight, quite as much as I wanted to handle, encumbered by my spacesuit. Once I had them laid out side by side on the sand, however, the bolting together was comparatively easy.
Camilo had switched on the helmet-radio belonging to one of the other spacesuits. From time to time he inquired:
"Have you seen any of them yet?"
Each time I assured him that I had not but, somehow, whether he answered, or remained silent, he managed to convey skepticism.
When the main floor was assembled, I went ahead with fixing the control-pillar. Thoroughly absorbed in the job, I lost all sense of my surroundings, remembering the empty stillness only when Camilo spoke. But when, after some two and a half hours, I had the assembly complete, and needing only a final check before the mounting of the fuel containers, my attention slackened and, with that, the bleakness and loneliness all about seemed to press closer and crowd me.
I decided I had put in a long enough spell outside for one day, and would be wiser to get back to the familiarity of the ship and the comfort of a meal before the willies could encroach enough to trouble me badly. As I came through the airlock I found Camilo seated on the pull-out stool in front of my charting-board. He turned round and watched me attentively; when I took off the helmet he seemed to relax, and looked somewhat relieved. I glanced at the radio transmitter, hoping that he might
