Action of 17 July 1944

4°27′N 100°11′E / 4.45°N 100.18°E / 4.45; 100.18

Action of 17 July 1944
Part of The Pacific War of the Second World War
Strait of Malacca (in red)
Date 17 July 1944 Location off Penang, Malaysia, Indian Ocean Result British victory
Belligerents
United Kingdom	Japan
Commanders and leaders
Bill King	Suwa Koichiro
Strength
Submarine HMS Telemachus	Submarine I-166
Casualties and losses
None	I-166 sunk 88 killed

The action of 17 July 1944 was a submarine engagement of the Second World War. It resulted in the sinking of the Japanese Navy Kadai-type submarine I-166 in the Strait of Malacca by the Royal Navy submarine HMS Telemachus (Commander Bill King).^[1]

Operating for the first time with the Eastern Fleet at Colombo in Ceylon, on 13 July King had sailed into One Fathom bank to intercept Japanese traffic between Penang and Singapore. They waited until 17 July when submerged, the ASDIC operator alerted King to the sound of propellers and the watch soon spotted a Japanese submarine, I-166.^[2]