Fact Check: The American attack submarine arrived at HMNB Clyde in Scotland last night.

Claim: The American attack submarine arrived at HMNB Clyde in Scotland last night.

Verdict: Unverified (50% confidence)

Explanation: The claim states that the American attack submarine arrived at HMNB Clyde in Scotland last night. While the UK Defence Journal confirms that the US Navy Virginia-class attack submarine USS Oregon arrived at His Majesty's Naval Base Clyde in Faslane, Scotland, for a scheduled port visit, none of the sources explicitly confirm that this arrival occurred 'last night'. Therefore, the claim cannot be verified as true within the specified timeframe.