Icebergs mark the approach to the Antarctic Peninsula. Trying to catch the predawn light means being on deck well before the 3:15 a.m. sunrise, when subtler hues bathe the ice forms.

Icebergs mark the approach to the Antarctic Peninsula. Trying to catch the predawn light means being on deck well before the 3:15 a.m. sunrise, when subtler hues bathe the ice forms.