For the first time ever, Canada has deployed a Victoria-class submarine on patrol to Asia.
CBC News has learned HMCS Chicoutimi left Esquimalt, B.C., sometime in mid-September for the Asia-Pacific region.
"Her deployment at sea signals the strategic importance of the Asia-Pacific region to Canada," said a military spokesperson in an email.
HMCS Chicoutimi will "provide the government with defence and security options should a timely Canadian response be necessary," he wrote.
The navy would not give exact details about what the sub would be doing, or where.