sentences:  During World War II, Biuku Gasa and Eroni Kumana were tasked with patrolling the waters of the Solomon Sea near Gizo by Australian coastwatcher Sub-Lieutenant Arthur Reginald Evans, who manned a secret observation post at the top of Kolombangara island's Mount Veve volcano, and had five two-man teams of islanders working for him.Evans had spotted an explosion on 1 August, and later that morning decoded news that the explosion he had witnessed was probably from the lost "PT-109".On 2 August Gasa and Kumana were dispatched by Evans to search in their dugout canoe for possible "PT-109" survivors.