article_snippet.sent: The Finnish military says The Finnish military has dropped depth charges onto a suspected submarine in the sea outside Helsinki after twice detecting the presence of a foreign object.
article_snippet.sent: A Finnish coastguard ship tracks the underwater object - believed to have been a Russian submarine - in the waters near the capital Helsinki .
article_snippet.sent: Pictured is a Finnish navy boat .
article_snippet.sent: Finland first alerted its navy to a 'possible underwater target' about midday yesterday . '
article_snippet.sent: In a statement, the Finland Ministry of Defence said the Finland Ministry of Defence surveillance system first alerted the Finland Ministry of Defence to a 'possible underwater target' within territorial waters about midday yesterday.
highlights_snippet.sent: The Finnish military has dropped depth charges on a possible submarine .
  
highlights_snippet.sent: The Finnish military navy twice detected a foreign object within Helsinki territorial waters .
  