There are numerous machines in this universe that go 'ping.' Estim is fascinated by them all on some level, or at least the ones she's seen in person. Here she uses a device that goes 'jujun,' known to the treasure-hunting world as the stalwart metal detector.

Except that's slightly inaccurate: she constructed a bone detector, an archaeological ally. Moria's pleased with its performance so far - right up until both of them failed to notice the conspicuous Tyrannosaurus leering at them like the pieces of meat they are. Or maybe he's trying to take a nap and hated being bothered by machines - and oblivious wanderers.

Art and T-Rex by:  marauder6272
Estim and Moria by:  brunicus