Sense we already have lava/water would it maybe be a step forward to introduce a tare pit? A pit of black thick water; that once you step one or two steps into you were sucked in so your only escape would be death
And also, an underground oil reserve maybe not much but enough that if found you might be able to run a lamp or two off it for a while (maybe a day of weeks or even a month)???
And also, an underground oil reserve maybe not much but enough that if found you might be able to run a lamp or two off it for a while (maybe a day of weeks or even a month)???