Second Bell Subsurface Probe

Second Bell Subsurface Probe is a rugged impulse probe pressed against decks, walls, or packed ground to find voids, pipes, buried cable, and the suspicious absence where something ought to be. Each survey needs a clean contact patch and a few patient passes; slap it against painted rust and it mostly maps painted rust. Stored scans include location and material signatures, valuable to salvagers and to anyone planning where a shaped charge might do its best work. Its amber telltale stays legible through smoke and brownouts, but the service hatch opens with common dock tools; foremen like that, while procurement officers complain it invites unauthorized tinkering.