The earliest evidence occurs in a mound 23 feet (7 metres) deep discovered beneath massive alluvial deposits.
It renders us unable to dive into our deeps, discover what we want, and fashion out of that desire a unique life story in which we achieve it.
Drillers have to go down deeper and deeper to discover more oil; sinking a well in Oklahoma can cost over $1m.
But you don't have to dig deep to discover a crushing sadness.
But you don't have to dig very deep to discover a more complicated picture.
Plotwise: it'll be the same story of an underestimated "bum" reaching deep to discover some champion within.
Backstage, Maslany talked about "digging deep to discover new instincts and impulses to color each of the characters" she plays, according to Times awards columnist Glenn Whipp.
Or you can look deeper and discover the sadness below the chin-up optimism.
Dig deeper to discover that salt inhibits bitterness as honey counteracts spice.
But this busy, frazzled play only rarely looks deeper to discover the substance beneath.
