The number of unaccounted for migrants on the island has doubled in the last four years, reaching 90,000 this January.

This story was produced in partnership with the Pulitzer Center.

Taichung City, Taiwan – Bernard keeps a low profile.

Heading to work on the streets of Taiwan, the 45-year-old Filipino migrant worker dodges glances and often checks his face mask to make sure his appearance is concealed.

To hide his accent, he often speaks in a near-whisper.