In reply to Chris H:
> (In reply to Andy Mountains) Seemed a bit contrived at times. Why didn`t they chuck some dye into the glacier to track the streams rather than a load of orange balls?
I understood those balls had a transmitter in them so it shouldn't have been too difficult to get fix on them once they emerged into the sea rather than trying to spot them visually.
I don't think they discovered much that was startlingly new to science. The fact that glaciers are lubricated by melt water running under them has been known for years, as has the fact that glacial lakes suddenly drain when their sink hole opens. Other than for getting some spectacular shots of the guy in a precarious position at the top of a crumbing 100m plus ice cliff why was it necessary to put the monitor right at the edge, when it was going to collapse at any second? Monitors at various points right up the glacier would have given them the flow rate, as would marker poles monitored by regular triangulation, something glacialogists have been doing for decades. What was the point of abbing into a large sink hole to discover a lateral passage - again phenomena which have been known about for decades?
The only thing which I believe was new was the discovery of the deep undercut under the ice cliffs, and as someone said above much closer observations could have been made without outrageous risk to the mariners by using an unmanned remote controlled boat, or even a remote controlled submarine.
But even so stunning filming.