The Lost Passage is a digitally reconstructed world of a swarm of artificial passenger pigeons, which went extinct in the early 20th century. As a sociable flock, they once grew to a population of over 5 billion in the 1800s before going into extinction within four decades due to human intervention. In their new imaginary home, they inhabit a never-ending, sublime, yet destitute memory of a lost landscape. However, on closer inspection they are actually confined within the four walls of this space. The Lost Passage reflects upon the historical moment of the Passenger Pigeon’s holocene extinction by using artificial intelligence and machine learning to resurrect a memory of a lost passage, thus evoking a sense of being trapped and confined through the sublime imagery.