(warning, boring story follows).
so i have a little single player world. i haven't been there there
long. i found an amazing cave a few minutes walk away from my base. i
explored it for a while and loaded up on iron and coal, carefully
marking my path so i could find my way back up. (there was some gold
there too but i hadn't made an iron pick yet).
it was getting late (irl) so I decided to go back home. got almost
to the surface when i was ambushed by a skeleton! i noobishly
had no bacon or other means to restore health and i ended up full of
arrows and dead. when i respawned it was daylight (thankfully) so i
bolted as quick as i could back to the spot to get my loot before it
but i couldn't find the entrance! it was kind of hard to see; just a
flat hole in grass and i hadn't had the sense to mark it. eventually i
found it but it was too late and all my stuff was gone. this includes
a heap of glass that i had made and all my torches, my tools, my wood,
some flint. everything. :(