This skill covers the construction, placement, and concealment of booby traps and snares, both high-tech (bombs, mines, etc.) and low-tech (pits, spring traps, etc.) The time to prepare and place these items depends upon the complexity of the item and on surrounding conditions as determined by the GM. Generally, it will rake five minutes to place, prime and conceal a simple trap. Digging a pit might take several hours. Successful covert engineering is at -10 to detect.