This clip provides an animated visualisation of the depth Titanic lies at.
https://www.youtube.com/watch?v=Q5C7sqVe2Vg
As deep as this clearly demonstrates many of the oceans are, it's facsinating to think that if the earth were an apple, the thickness of the skin equates to average sea depths. If you then cut the apple into four quarters, the skin of one of those quarters near enough equates to the earths landmass (29%). Of all the water on the planet freshwater equals just 3% and 75% of that is frozen in the ice caps (I'm full of this sort of rubbish XD).