In the late afternoon we did a tour of the helicopters, and reviewed the
procedure that will be followed when we use them, which may be in just
another day! By 6 p.m. we had great views of the Drygalski Ice
Tongue (the part of a glacier that extends over the water) and the
behemoth Iceberg B-15. The iceberg broke off the Ross Ice Shelf a
few years ago. Initially, it was as large as the Grand Canyon, but
bits and pieces have broken off over the years. It is still
enormous and drifting slowly about in the Ross Sea. It had been
heading towards Drygalski for a while, and many speculated that there
would be a collision. But, it appeared that B-15 was hung up on
the ocean floor, a mere three miles from the ice tongue. We
cruised into this gap and then spent the entire next night
circumnavigating the iceberg. Some months after this trip, there
was a collision and the end of the ice tongue has broken off - the
picture below is one of the last to show what it looked like!
The main problem that B-15 is causing (and, that is the iceberg in my
page borders - top and bottom) is that it is trapping ice behind
it,
between McMurdo and the open sea. Usually, at the onset of summer,
the ice in McMurdo breaks up and blows out to sea, leaving the waters
navigable, as indeed Scott and Shackleton did in the early 1900s.
But, now, the ice isn't blowing out to sea and is getting a fresh dose
every winter, which makes it harder to break up and dissipate the next
year. Our path was to follow the north side of the iceberg for its
many hundred miles and then duck into McMurdo Sound near Ross
Island. Of course, the Khlebnikov is an icebreaker, so it is built
for dealing with these conditions.
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