as the tractor reversed down the slope. On either side of the runway the army engineers had cleared the forest for a hundred yards, and the uneven ground was a forgotten terrain of mud-filled gulleys, hillocks of pulverized earth, and dumps of flourishing underbrush.
The tractor blundered across this no-man’s land, the driver straining his arms to hold the machine on its course towards the forest road that ran from the eastern end of the airstrip to the shores of Lake Kotto. He climbed the last of the hillocks, and then faced a ramp of compacted earth which the engineers had erected for their supply vehicles. The sergeant throttled up his engine, lowered the scoop and thundered forward in a roar of smoke and oil. The metal blade sank into the ramp, and cut away a huge block of compressed gravel mounted on a section of underlying soil that contained the root-tree of a forest oak.
This immense black core lay partly exposed, like the petrified heart of an extinct bull, or the crown of an underworld deity ripped from the ceiling of a subterranean palace whose arches supported the airstrip, a submerged cathedral of mud. The soil wept through its roots and fell into the dark maw of the cavern below, an open mouth wide enough to swallow a small car.
The sergeant reversed his gears, and briefly cut back his engine. He looked up at me, as I watched from the edge of the runway, clearly expecting me to order him to ignore this obstacle and make a sensible detour around it. But I waved him forward, curious to see how large this root-system might be – clearly the felled tree had been one of the tallest oaks in the forest, sitting for hundreds of years at the water table of Lake Kotto, until cut down to make way for Sanger’s runway extension and his preposterous mission. I felt the ground under my feet, hoping to hear a rumble of subsidence – with luck, the removal of this ancient root would undermine the runway and the Dakota would crash on take-off …
The sergeant worked up his engine, smoke pumping from the exhaust stack behind his head. He engaged the gears and drove forward, gradually forcing the root-crown from the cavity where it rested. To my disappointment, it failed to put up any great fight, but lay passively against the tractor’s scoop, a gnarled mass of dead roots some six feet in diameter. Forced on to its back, it rolled soundlessly into a hollow between two nearby hillocks and expired there in a cloud of sandy dust, a long-dead god of the earth.
I waited as the tractor rumbled forward, its treads easily straddling the cavity below. As the sergeant headed towards the forest path I walked down the earth ramp and peered into the open mouth. Scores of torn roots emerged from the ground-soil, the crop of a strange subterranean plantation. To my surprise, however, a small pool of water had appeared at the base of the cavity. As if leaking from the amputated roots, the dark liquid slowly covered the sandy floor, the last sap of the dead oak irrigating its own grave.
All too aware of the irony that I had at last struck water, I gathered the loose soil between my feet and swept it into the cavity. But the water was already several inches deep, fed from some underground stream, part of an artificial reservoir, I assumed, created by the construction of the airstrip. I gazed down, seeing my own face reflected in the black mirror from which the dead roots of the oak rose to greet me. I kicked a last shower of earth into my reflection and strode down the remains of the ramp, following one of the parallel pathways left by the tractor.
Fifty yards into the forest, I stopped to wait for the tractor’s smoke to dissipate through the trees. Looking back, I could see the pattern of metal tracks stamped into the long bracelets of soil that led to the airstrip.
A thin stream of water, little more than the width of my arm, flowed along the track, carried by the slight gradient that ran down to the lake. While I waited, it crept