Their hopes were dashed, however, when they encountered rapids near the town of Kratie, in Cambodia, and a formidable series of cataracts called the Khone Falls, in southern Laos.
Tetapi, harapan mereka kandas sewaktu mereka tiba di jeram dekat kota Kratie, di Kamboja, dan di serangkaian riam yang mustahil dilalui yang disebut Air Terjun Khone, di Laos bagian selatan.