Keep Calm And Carry On Aqua

its actually very handy to dig straight down because you could get to diamond level faster :)

well true that but what if you fall in lava

if you're smart you can hear if there's lava and you mine straight a little you've probaly avoided the lava, then just walk a block backwards and mine a few blocks down and check if there's any lava under you.

You can if you stand inbetween 2 blocks

MINE DIAMONDS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!