Russian Akula Class Submarine
Finland takes a harsh view of submarines poking around her harbors.
Finland has fired warning shots at a suspected foreign submarine off the coast of Helsinki in the early hours of Tuesday morning, amid growing military tensions with neighbouring Russia.
Carl Haglund, Finland's defence minister, did not say whether Russia was involved, but the incident was reminiscent of a Swedish hunt for a foreign submarine in its waters last October that many thought to be Russian.
Mr Haglund told Finnish media that the target has likely left the area, adding that Finland has rarely used such warning charges.
"We strongly suspect that there has been underwater activity that does not belong there. Of course it is always serious if our territorial waters have been violated," Mr Haglund told Finnish news agency STT.
"The bombs are not intended to damage the target, the purpose is to let the target know that it has been noticed," Commodore Olavi Jantunen told Helsingin Sanomat newspaper.
The navy said it noticed an underwater target on Monday and again on Tuesday morning and dropped depth charges the size of grenades.