The slave ship S José Diligente Vulcano departed on a transatlantic slave-trading voyage that would carry enslaved Africans to Brazil.

Vessel: S José Diligente Vulcano; flag: Portugal / Brazil; rig: Bergantim. People recorded in connection with the voyage: Captain: Alves, Isidoro; Investor: Alves, Isidoro. The voyage began at Rio de Janeiro on 4 May 1821. Principal recorded place where captives were acquired: Congo River (West Central Africa and St Helena). Principal recorded disembarkation place: Maranhão. Recorded duration of the captives' Atlantic crossing: 30 days. Estimated mortality during the crossing: 2.0%. Recorded outcome: Voyage completed as intended.