You can see it in the last Smarter Every Day video[1] where they're talking about surfacing a submarine in the arctic ocean.

At several points you can see a video monitor showing an upward view of the ice.

[1] https://youtu.be/XFJnWp1tAdU?t=1427

e: to be clear, that upward looking camera isn't going to be enough to detect much beyond your own footprint. If someone is about to cross that area you'd need some other way of detecting them.