City Workers Find Something Blocking Tunnel — Then They Realize What It Is

A sharp smell

As the men argued about what to do next, the blockage oozed a thick, yellowish slime where it was scratched. The smell from it was sharp, burning in their nostrils.

Luis stepped back, wrinkling his nose, and Mike radioed the office again, asking for heavier gear. Their unease was quickly rising by the minute.