Because they're robots in disguise.
There is 2 shafts in a coal mine.
down
safety
they are also known as pies or infections
Spawners are found in dungeons and mine shafts.
(I take it you are referring to the abandoned mine shafts.) The mine shafts were added to the PC version at the 1.8 update. The Xbox version is at 1.6.6, so you can't find any.
you just randomly click
an air velocity meter to measure the speed of ventilating air in mine shafts
an air velocity meter to measure the speed of ventilating air in mine shafts
it goes deeper into the earth and gets hotter.
The Greeks and Romans were using them 2500 to 3000 years ago to pump out mine shafts.
child laborers who worked in dangerous mine shafts