"Grouper"'s next four patrols netted her no further kills, despite several determined attacks, but the patrols illustrated the varied tasks submarines took on during the war. In addition to her regular patrol duties, which harassed Japanese shipping and tied up valuable warships desperately needed by the enemy, "Grouper" landed 50 men and of gear on New Britain to carry on guerrilla warfare; at the same time, she rescued an American aviator who had been stranded there almost three months. This mission is depicted in episode 21 of The Silent Service, an American TV series that aired for two seasons in 1957 and 1958. It is available on YouTube.