CBC article on the previously mentioned 17 ship Taskforce -The wording of the news release begs a few questions. It could be an uncharted seamount or wreck- it happens, as our knowledge of the seabottom is never 100%.
It could also have been another submarine or a ship. The reason that can happen when relying on passive sonar is that while it is relatively easy to determine a bearing to another contact, range to contact is always a dark art.
"Chinese intelligence-gathering vessels were in the region,"
"I've been in the navy for 20 years and I have never been in such a showcase of naval power," said Layton.