Continuing my daydream into glacial and polar lakes I remembered posting this photoshoppery I did years ago on the blog; the great Mars Explorer OX traversing an ancient ice hollow on the red planet.
Discussing submersibles voyaging through polar seas also reminded me of a novel I read as a 17 year old some 40+ years ago, The Many Coloured Land by Julian May. It was the first book in the Saga of the Exiles and at least one other was called the Golden Torc.
What I recall more than anything is a passage describing a spaceship zooming through the icy seas of the Pleistocene. It was a a fabulous image and the book's ice-age roots were hinted at on the beautiful cover it had back then in the 70's with the central motif being a Mammoth's skull. I imagine this cover has changed many times as the book was reprinted over the coming interbellum.
Do you remember this book?