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Kahega called to him in Swahili； Munro turned to Ross and said； 〃Kahega wants to know how to pitch the tents。〃
Kahega was holding a crumpled silver ball of fabric in his outstretched hand； the other porters were just as confused； rummaging through their loads； looking for familiar tent poles or stakes； finding none。
The ERTS camp had been designed under contract by a NASA team in 1977； based on the recognition that wilderness expedition equipment was fundamentally unchanged since the eighteenth century。 〃Designs for modern exploration are long overdue；〃 ERTS said； and asked for state…of the…an improvements in lightness； fort； and efficiency of expedition gear。 NASA had redesigned everything； from clothing and boots to tents and cooking gear； food and menus； first…aid kits； and munications systems for ERTS wilderness parties。
The redesigned tents were typical of the' NASA approach。 NASA had determined that tent weight consisted chiefly of the structural supports。 In addition； single…ply tents were poorly insulated。 If tents could be properly insulated； clothing and sleeping…bag weight could be reduced； as could the daily caloric requirements of expedition members。 Since air was an excellent insulator； the obvious solution was an unsupported； pneumatic tent： NASA designed one that weighed six ounces。
Using a little hissing foot pump； Ross inflated the first tent。 It was made from double…layer silvered Mylar； and looked like a gleaming ribbed Quonset hut。 The porters clapped their hands with delight； Munro shook his head； amused； Kahega produced a small silver unit； the size of a shoebox。 〃And this； Doctor？ What is this？〃
〃We won't need that tonight。 That's an air conditioner；〃 Ross said。
〃Never go anywhere without one；〃 Munro said； still amused。
Ross glared at him。 〃Studies show；〃 she said； 〃that the single greatest factor limiting work efficiency is ambient temperature； with sleep deprivation as the second factor。〃
〃Really。〃
Munro laughed and looked to Elliot； but Elliot was studiously examining the view of the rain forest in the evening sun。 Amy came up and tugged at his sleeve。
Woman and nosehair man fight； she signed。
Amy had liked Munro from the beginning； and the feeling was mutual。 Instead of patting her on the head and treating her like a child； as most people did； Munro instinctively treated her like a female。 Then； too； he had been around enough gorillas to have a feeling for their behavior。 Although he didn't know ASL； when Amy raised her arms； he understood that she wanted to be tickled； and would oblige her for a few moments； while she rolled grunting with pleasure on the ground。
But Amy was always distressed by conflict； and she was frowning now。 〃They're just talking；〃 Elliot assured her。
She signed； Amy want eat。
〃In a minute。〃 Turning back； he saw Ross setting up the transmitting equipment； this would be a daily ritual during the rest of the expedition； and one which never failed to fascinate Amy。 Altogether； the equipment to send a transmission ten thousand miles by satellite weighed six pounds； and the electronic countermeasures； or ECM devices； weighed an additional three pounds。
First； Ross popped open the collapsed umbrella of the silver dish antenna； five feet in diameter。 （Amy particularly liked this； as each day progressed； she would ask Ross when she would 〃open metal flower。〃） Then Ross attached the transmitter box； plugging in the krylon…cadmium fuel cells。 Next she linked the anti…jamming modules； and finally she hooked up the miniaturized puter terminal with its tiny keyboard and three…inch video screen。
This miniature equipment was highly sophisticated。 Ross's puter had a 189K memory and all circuitry was redundant； housings were hermetically sealed and shockproof； even the keyboard was impedance…operated； so there were no moving parts to get gummed up； or admit water or dust。
And it was incredibly rugged。 Ross remembered their 〃field tests。〃 In the ERTS parking lot； technicians would throw new equipment against the wall； kick it across the concrete； and leave it in a bucket of muddy water overnight。 Anything found working the next day was certified as field…worthy。
Now； in the sunset at Moruti； she punched in code coordinates to lock the transmission to Houston； checked signal strength； and waited the six minutes until the transponders matched up。 But the little screen continued to show only gray static； with intermittent pulses of color。 That meant someone was jamming them with a 〃symphony。〃
In ERTS slang； the simplest level of electronic jamming was called 〃tuba。〃 Like a kid next door practicing his tuba； this jamming was merely annoying； it occurred within limited frequencies； and was often random or accidental； but transmissions could generally pass through it。 At the next level was 〃string quartet；〃 where multiple frequencies were jammed in an orderly fashion； next was 〃big band；〃 where the electronic music covered a wider frequency range； and finally 〃symphony；〃 where virtually the full transmission range was blocked。
Ross was now getting hit by a 〃symphony。〃 To break through demanded coordination with Houston…which she was unable to arrange…but ERTS had several prearranged routines。 She tried them one after another and finally broke the jamming with a technique called interstitial coding。 （Interstitial coding utilized the fact that even dense music had periods of silence； or interstices； lasting microseconds。 It was possible to monitor the jamming signals； identify regularities in the interstices； and then transmit in bursts during the silences。）
Ross was gratified to see the little screen glow in a multicolored image…a map of their position in the Congo。 She punched in the field position lock； and a light blinked on the screen。 Words appeared in 〃shortline；〃 the pressed language devised for small…screen imagery。 F I L D TME…POSITN CHEK； PLS CONFRM LOCL TME 18：04 H 6/17/79。 She confirmed that it was indeed just after 6 P。M。 at their location。 Immediately； overlaid lines produced a scrambled pattern as their Field Time…Position was measured against the puter simulation run in Houston before their departure。
Ross was prepared for bad news。 According to her mental calculations； they had fallen some seventy…odd hours behind their projected timeline； and some twenty…odd hours behind the consortium。
Their original plan had called for them to jump onto the slopes of Mukenko at 2 P。M。 on June 17； arriving at Zinj approximately thirty…six hours later； around midday of June 19。 This would have put them onsite nearly two days before the consortium。
However； the SAM attack forced them to jump eighty miles south of their intended drop zone。 The jungle terrain before them was varied； and they could expect to pick up time rafting on rivers； but it would still take a minimum of three days to go eighty miles。
That meant that they could no longer expect to beat the consortium to the site。 Instead of arriving forty…eight hours ahead； they would be lucky if they arrived only twenty…four hours too late。
To her surprise； the screen blinked： FILD TME…POSITN CHEK ： …09 ： 04 H WEL DUN。 They were only nine hours off their simulation timeline。
〃What does that mean？〃 Munro asked； looking at the screen。
There was only one possible conclusion。 〃Something has slowed the consortium；〃 Ross said。
On the screen they read EURO/NIP0N C0NSRTIM LEGL TRUBL GOMA AIRPRT ZAIR THEIR AIRCRFT FOUND RADIOACTIVE TUF LUK FOR THEM。
〃Travis has been working back in Houston；〃 Ross said。 She could imagine what it must have cost ERTS to put in the fix at the rural airport in Goma。 〃But it means we can still do it； if we can make up the nine hours。〃
〃We can do it；〃 Munro said。
In the light of the setting equatorial sun； Moruti camp gleamed like a cluster of dazzling jewels…a silver dish antenna； and five silver…domed tents； all reflecting the fiery sun。 Peter Elliot sat on the hilltop with Amy and stared at the rain forest spread out below them。 As night fell； the first hazy strands of mist appeared； and as the darkness deepened and water vapor condensed in the cooling air； the forest became shrouded in dense； darkening fog。
DAY 6： LIKO
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