On April 16, 1770, the "San Antonio" set sail from San Diego Bay, carrying Serra, doctor Pedro Prat, engineer Miguel Costansó and a crew of sailors under captain Juan Pérez. Contrary winds blew the ship back south to the Baja peninsula, then as far north as the Farallon Islands. As the ship heaved against heavy winds, Pérez, Serra and sailors recited daily prayers, promising to make a novena and celebrate High Mass upon their safe arrival in Monterey. Several sailors fell sick with scurvy. Serra described the six-week voyage as "somewhat uncomfortable."