Test it with a magnet.
In industrial term, a containment to collect of waste water or waste oil
because you no when the can full from you can hear the loud sound
Dip stick
A dry sump is not submerged under water as a wet sump is. a dry sump uses a resivoir to hold the oil much like the brake fluid. a wet sump has the oil sump bolted to the bottom of the engine block :D
In 1980, German cave-diver, Jochen Hasenmayer, passed Sump # 25 in Falkensteiner Höhle and discovered Sump # 26.