Tank cleaning operations on the tanker Malwa (1961) while under way at sea. The photographer is standing on the upper deck ahead of the superstructure looking forward showing all of the tank ventilators open. Two men in blue overalls and another in light blue overalls are moving towards the open tank hatches in the foreground. A fourth man is in the middle ground standing next to empty davits on the port side of the ship. The samson posts and derricks and the foremast, along with the walkway, are in the background. This is Slide 46 of a lecture given by Captain Henry P. Bird detailing his service as Senior Second Officer and Navigator on board the tanker Malwa (1961), owned by the P&O Group, from 14 November 1963 to 9 March 1964. The lecture consists of 75 slides.