Light in underground caverns is provided by lava flowing across the ceiling, held in place by centrifugal force. Rhinoceroses were made with four legs for a reason. Prehistoric humans did not have surnames, but everyone received a descriptive phrase attachment. Having excitable pig-men around is bad, but it is worse when they have whips and spears. Reeds can be quickly converted into arrows and are capable of killing large animals.
Big guys carry big maces.
Explorers always pack an extra set of fine clothes for joyous departures. 7 mins - Your drilling machine is a long tube, of course it can't turn on a dime. 15 mins - I think Polly wants to bite your head off. That looks like a carnivorous plant. 41 mins - Hey guys, the plant is trying to eat you.