Jens Kristensen, a 48-year-old Dane in the UN’s Haiti mission, had been trapped for five days in a coffin-size space under the rubble of his office when an American rescue team found him, miraculously alive. Bruised, dehydrated and no longer able to keep track of time, Kristensen nonetheless sized up the disaster all around him, skipped trauma counseling and was back at work within three days.