So, how deep is that exactly?

Jenni at Abaddon Books has recently been giving my first three Pax Britannia novels an overhaul in preparation for the release of the first Ulysses Quicksilver Omnibus later this year. Having read about UQ's exploits at the bottom of the Pacific Ocean on the edge of the Marianas Trench, she sent me this...

... which just goes to show precisely how deep the deepest measured stretch of the ocean really is. I mean it's completely dark from less than a mile down! There could be anything lurking down there!