Amazing how it all went in one blow. I did expect it to break a few weeks ago when the cracks first showed up in the area, but when the initial danger passed I was hoping the arch could survive.
Considering the Lincoln Sea is one of the last resorts of thick old static MYI, this is another piece of bad news for the melting season. There is no arch in Kane Basin and the strait has already been flushed recently, so resistance to southbound export will be minimal besides the normal "traffic jams". Extent might not suffer in the beginning, should even go up in the vicinity, but volume-wise and fast forwarding to the next few months, it's one more nail in the coffin.