The Australian Services Reconnaissance Department (SRD) also collected intelligence on Labuan and other parts of the Brunei Bay area during May. On the first of the month several RAAF PBY Catalina aircraft carrying SRD personnel overflew Labuan. These aircraft later landed near two native prahu and questioned their crews; two sailors were flown back to an Allied base for further questioning. On 15 May two Malays working for the SRD were landed in Brunei Bay by a Catalina, and sailed to Labuan on board a prahu. These agents recruited a local civilian from Labuan, and the party was extracted by a Catalina near the mainland village of Kampong Mengalong on 19 May. The intelligence gained from these operations provided the Australians with a good understanding of Labuan's geography and infrastructure. In addition, civilians who had been recruited by the SRD's SEMUT 2 team (which had been parachuted into Borneo during April) provided intelligence on the size and movements of Labuan's garrison force.