So yesterday I was running my TConstruct smelter, and generally doing a bunch of TC.
I needed another bucket of lava, so I went to the nether, however the chunks dust load until I was actually in them, so I though I was flying onto a ledge beside a large lava lake, when I flew straight into a large lava slick, and sank.
I was carrying all my aluminium, diamonds (10, I had needed some iron to make the bucket...) and my spellbook, with the spells I had spent the previous night writing out, and was carrying my alumite pick with moss, my rapier with maxed out (no bonus modifyers) quartz and also my long fall boots.
I was shoved right back to step one with that one mistake.