After spending a night near the entrance, we finally sailed the Lemaire one day before lunch. The channel is a narrow strait between the Antarctic mainland and Booth Island, and the towering mountains on both sides made it feel like one of the fjords, with fewer waterfalls and more icebergs. (Plus some very powerful winds.)
It's on every Antarctic itinerary, but at first it did seem to me to be nothing I hadn't seen before -- beautiful mountains covered in snow, icebergs, some of them adorned with seals.
But the sun was behind us, and as we sailed towards the cloud-draped mountains in the distance, the scenery shifted away from pretty fjord-like mountains into something uniquely Antarctic.