The slave ship Haast U Langzaam left the African coast carrying enslaved Africans toward Guyana. About 365 people had been taken aboard.

Vessel: Haast U Langzaam; flag: Netherlands; rig: Fregat; estimated standardized tonnage: 448.7. People recorded in connection with the voyage: Investor: Middelburgsche Commercie Compagnie; Captain: Kakom, Cornelis van. The voyage began at Zeeland on 29 August 1779. Principal recorded place where captives were acquired: Cape Mount (Cape Grand Mount) (Windward Coast). Principal recorded disembarkation place: Demerara. Estimated mortality during the crossing: 13.0%. Recorded outcome: Captured by British - after disembarkation.