Guerrilla Marketing Feature: Ad Underworld

(Via: Design Verb!)

One of the effects of global warming and destruction of rain forests is that sea levels rise at an accelerated pace, which means saltwater intrusion, disruption of marine life, floods, and disturbance with infrastructure. So ads were placed underworld in order to build awareness about the related issue.

Great ad placement because it would definitely take you by surprise seeing a city submerged underwater.