The Echo over Calder Field

At five in the morning, Calder Field smelled of cut grass and cold metal. Fourteen balloons lay stretched across the meadow like sleeping animals, and the only light came from the gas burners of the crew testing their flames.

Pukul lima pagi, Calder Field berbau rumput yang baru dipotong dan logam dingin. Empat belas balon udara terbentang di padang rumput seperti binatang yang sedang tidur, dan satu-satunya cahaya datang dari pembakar gas milik kru yang sedang menguji nyala api mereka.

Nami stood on the announcer's platform with the microphone in both hands. It was not a normal microphone. The university had lent it to the field two months earlier, with a warning on a sticky label: PROTOTYPE. DO NOT DROP. DO NOT EXPLAIN TO VISITORS.

Nami berdiri di panggung pengumuman sambil memegang mikrofon dengan kedua tangan. Itu bukan mikrofon biasa. Universitas meminjamkannya kepada lapangan itu dua bulan sebelumnya, dengan peringatan di sebuah label perekat: PROTOTIPE. JANGAN DIJATUHKAN. JANGAN DIJELASKAN KEPADA PENGUNJUNG.

Every sound she made into it came back a few seconds later, thin and slightly bent, like a voice from the bottom of a well. The students called it the echo microphone. It was supposed to measure the layers of air above the field, and in the first week she had hated it.

Setiap suara yang ia ucapkan ke dalamnya kembali beberapa detik kemudian, tipis dan sedikit melengkung, seperti suara dari dasar sumur. Para mahasiswa menyebutnya mikrofon gema. Alat itu seharusnya mengukur lapisan-lapisan udara di atas lapangan, dan pada minggu pertama ia membencinya.

"Good morning, pilots," she said now.

"Selamat pagi, para pilot," katanya sekarang.

Good morning, pilots, said the sky, very faintly, six seconds later.

Selamat pagi, para pilot, kata langit, sangat lirih, enam detik kemudian.

"That's a long one," said Verena, climbing the steps with a mug of coffee and a clipboard. She was the lead pilot of the field, a tall woman in a flight jacket. It had been repaired so often that it was mostly patches. "Yesterday it came back in four."

"Yang itu lama sekali," kata Verena, yang menaiki tangga sambil membawa secangkir kopi dan papan jepit. Ia pilot utama di lapangan itu, seorang perempuan jangkung berjaket terbang. Jaket itu sudah begitu sering diperbaiki sehingga sebagian besarnya hanya tambalan. "Kemarin gemanya kembali dalam empat detik."

"It keeps rising," said Nami. "Six seconds up and down means something solid, about a kilometre over our heads. A sheet of warm air, sitting there like a lid. The students say it will vanish once the sun gets strong."

"Waktunya terus bertambah," kata Nami. "Enam detik pergi-pulang artinya ada sesuatu yang padat, sekitar satu kilometer di atas kepala kita. Selapis udara hangat yang diam di sana seperti tutup. Kata para mahasiswa, lapisan itu akan lenyap begitu matahari menguat."

"Which is exactly my problem," said Verena.

"Dan itulah masalahku," kata Verena.

She held out the clipboard. On it were two flight plans, and she had been carrying them around since midnight.

Ia mengulurkan papan jepitnya. Di atasnya ada dua rencana penerbangan, yang sudah ia bawa ke mana-mana sejak tengah malam.

The first was the school flight. A class of fifteen-year-olds from the valley had spent a whole term building twelve tiny sensors, each the size of a matchbox. They wanted them lifted to the warm layer and dropped through it on small parachutes. It was the first real science many of them had ever done.

Yang pertama adalah penerbangan sekolah. Sekelas anak lima belas tahun dari lembah telah menghabiskan satu semester penuh untuk membuat dua belas sensor mungil, masing-masing seukuran kotak korek api. Mereka ingin sensor-sensor itu diangkat ke lapisan hangat dan dijatuhkan menembusnya dengan parasut kecil. Itu adalah kegiatan sains sungguhan pertama bagi banyak dari mereka.

The second was the film flight. A small crew wanted to shoot the sunrise from a balloon basket for a documentary about the valley. Their payment would cover the field's insurance for half a year, and the producer had said, politely but firmly, that she could only come today.

Yang kedua adalah penerbangan film. Sebuah kru kecil ingin merekam matahari terbit dari keranjang balon untuk film dokumenter tentang lembah itu. Bayaran mereka akan menutup asuransi lapangan selama setengah tahun, dan sang produser sudah mengatakan, dengan sopan tetapi tegas, bahwa ia hanya bisa datang hari ini.

"I have one balloon with enough lift for either," said Verena. "Both are good flights. Both people trusted me. I keep adding up the reasons, and the numbers never come out different."

"Aku punya satu balon dengan daya angkat yang cukup untuk salah satunya," kata Verena. "Keduanya penerbangan yang bagus. Keduanya orang yang memercayaiku. Aku terus menjumlahkan alasan-alasannya, dan hasilnya tidak pernah berbeda."

"Then flip a coin," said Nami.

"Kalau begitu lempar koin saja," kata Nami.

"I tried. I didn't like the result, so I flipped it again."

"Sudah. Aku tidak suka hasilnya, jadi kulempar lagi."

Nami laughed, and the laugh came back to them from the sky a moment later, small and strange. She looked at the clipboard, then at the microphone. A thought was forming, but she did not trust it yet.

Nami tertawa, dan tawanya kembali kepada mereka dari langit sesaat kemudian, kecil dan aneh. Ia memandang papan jepit itu, lalu mikrofonnya. Sebuah gagasan mulai terbentuk, tetapi ia belum memercayainya.

"Give me ten minutes," she said. "I want to listen to something."

"Beri aku sepuluh menit," katanya. "Aku ingin mendengarkan sesuatu."

She turned the microphone toward the east, where the first pale line was opening over the hills, and spoke slowly into it. "Counting. One. Two. Three."

Ia mengarahkan mikrofon ke timur, tempat garis pucat pertama terbuka di atas perbukitan, dan berbicara pelan ke dalamnya. "Menghitung. Satu. Dua. Tiga."

The echo returned. Counting, it said. One. Two. Three. Nami checked her watch and counted under her breath. Six seconds, then a little less. She waited a minute and repeated the test.

Gema itu kembali. Menghitung, katanya. Satu. Dua. Tiga. Nami melihat arlojinya dan menghitung dalam hati. Enam detik, lalu sedikit kurang. Ia menunggu semenit dan mengulangi percobaannya.

Five and a half.

Lima setengah detik.

She waited again, and the next echo returned in a little over five.

Ia menunggu lagi, dan gema berikutnya kembali dalam waktu lebih sedikit dari lima detik.

"Verena," she said quietly. "Come here and listen."

"Verena," katanya pelan. "Kemarilah dan dengarkan."

They stood together while she spoke into the microphone three times, each a few minutes apart. The delay was shortening every time. The layer was not simply sitting over the field. It was sinking toward the ground as the sun climbed and the lower air began to warm.

Mereka berdiri bersama sementara ia berbicara ke mikrofon tiga kali, masing-masing berselang beberapa menit. Jedanya memendek setiap kali. Lapisan itu tidak sekadar diam di atas lapangan. Lapisan itu turun menuju tanah seiring matahari naik dan udara di bawahnya mulai menghangat.

"How long?" said Verena.

"Berapa lama?" tanya Verena.

"The students told me it would flatten out in about an hour. At this speed, I think it is less. Forty minutes, perhaps." Nami swallowed. "After that, there will be nothing to measure. And the film crew can fly again tomorrow. Can the students?"

"Para mahasiswa bilang lapisan itu akan mendatar sekitar satu jam lagi. Dengan kecepatan ini, kurasa lebih cepat. Mungkin empat puluh menit." Nami menelan ludah. "Setelah itu, tidak akan ada lagi yang bisa diukur. Dan kru film bisa terbang lagi besok. Apakah para siswa bisa?"

Verena did not answer straight away. She looked at the clipboard and then at the hills, where the line of light had turned from grey to the colour of pale honey.

Verena tidak langsung menjawab. Ia memandang papan jepit itu, lalu perbukitan, tempat garis cahaya telah berubah dari abu-abu menjadi warna madu pucat.

"No," she said. "Their sensors are built for one thing. A layer like this might not come again for weeks, and the class goes on holiday on Friday." She breathed out. "The film is good work. But a sunrise comes back every day, and this does not."

"Tidak," katanya. "Sensor mereka dibuat hanya untuk satu hal. Lapisan seperti ini mungkin tidak muncul lagi selama berminggu-minggu, dan kelas itu libur hari Jumat." Ia menghela napas. "Film itu karya yang bagus. Tapi matahari terbit kembali setiap hari, sedangkan ini tidak."

"So you have your answer."

"Jadi kamu sudah punya jawabannya."

"I have my answer," said Verena, and her whole body seemed to loosen. "I just needed somebody to hand me a reason I could not argue with."

"Aku sudah punya jawabannya," kata Verena, dan seluruh tubuhnya seakan mengendur. "Aku hanya butuh seseorang yang memberiku alasan yang tidak bisa kubantah."

She went down the steps two at a time and began shouting for the ground crew. Somebody ran to the van for the harness. Somebody else ran to find the school team, and for a while the whole field was moving in a hurry. Soon the school team arrived, still half asleep in their jackets, carrying the twelve sensors in a padded box. They had been so sure they would be refused that nobody had brought a camera.

Ia menuruni tangga dua anak tangga sekaligus dan mulai berteriak memanggil kru darat. Seseorang berlari ke van untuk mengambil tali pengaman. Yang lain berlari mencari tim sekolah, dan untuk beberapa saat seluruh lapangan bergerak terburu-buru. Tak lama tim sekolah tiba, masih setengah mengantuk dalam jaket mereka, membawa kedua belas sensor dalam sebuah kotak berlapis busa. Mereka begitu yakin akan ditolak sehingga tak seorang pun membawa kamera.

Verena checked every sensor herself, one at a time, reading the small green numbers on each screen aloud. The students stood around her in a nervous half circle, and nobody dared to ask a single question until she finished. The producer was not happy when she was told. She nodded, however, when Verena offered her the first seat on tomorrow's flight, and she stayed to watch.

Verena memeriksa setiap sensor sendiri, satu per satu, membacakan angka-angka hijau kecil di setiap layar dengan suara keras. Para siswa berdiri mengelilinginya dalam setengah lingkaran yang gugup, dan tak ada yang berani mengajukan satu pertanyaan pun sampai ia selesai. Sang produser tidak senang ketika diberi tahu. Namun ia mengangguk saat Verena menawarkan kursi pertama pada penerbangan besok, dan ia tinggal untuk menonton.

At twenty to six the burners roared. The envelope filled, trembled, and slowly stood upright against the pale sky. Two of the students climbed into the basket with their padded box, laughing nervously, and Verena took the controls with one hand on the cord. She lifted her other hand to Nami in a short wave.

Pukul enam kurang dua puluh menit, pembakar-pembakar itu menderu. Selubung balon terisi, bergetar, dan perlahan berdiri tegak melawan langit yang pucat. Dua siswa naik ke keranjang bersama kotak mereka, tertawa gugup, dan Verena memegang kendali dengan satu tangan di tali. Ia mengangkat tangan satunya kepada Nami dalam lambaian singkat.

Nami raised the microphone one last time. She did not make an announcement. She simply said, "Good luck," and listened.

Nami mengangkat mikrofon itu untuk terakhir kalinya. Ia tidak membuat pengumuman. Ia hanya berkata, "Semoga berhasil," lalu mendengarkan.

The balloon rose, slowly at first and then with a steady, easy climb. It drifted over the fence, over the long line of poplars, and into the thin gold light. Its shadow slid across the meadow and disappeared. Soon it was only a small orange coin above the hills, getting smaller.

Balon itu naik, pelan pada awalnya lalu dengan tanjakan yang mantap dan mudah. Balon itu melayang melewati pagar, melewati barisan panjang pohon poplar, dan masuk ke cahaya emas yang tipis. Bayangannya meluncur di atas padang rumput lalu menghilang. Tak lama ia hanya tampak seperti koin oranye kecil di atas perbukitan, makin lama makin kecil.

Nami held the microphone against her chest and waited. A few seconds later, from somewhere very high above the field, the sky said it back to her, as softly as a breath.

Nami mendekap mikrofon di dadanya dan menunggu. Beberapa detik kemudian, dari suatu tempat yang sangat tinggi di atas lapangan, langit mengucapkannya kembali kepadanya, selembut embusan napas.

Good luck.

Semoga berhasil.