midnight
`` And remember , looking back will do you no good . '' This last warning was for Randy 's benefit , for the lad had just looked back and shivered over the awful descent below him . A fall would mean a long roll , and a broken neck over a cliff below . Captain Zoss had gone on ahead with the Indians and just before midnight he came back with a warning to watch out for several splits , or crevasses , in the glaciers they were now traversing . `` Salmon Head says he heard a report of several new ones just before starting , and these are as yet unmarked , '' he said . `` We 'll be as careful as we can , '' said Dr. Barwaithe . `` We can do no more . ''