Britain's Mystery Boat, Submarine Chaser P.31, on the Thames
![](https://www.westernfrontassociation.com/media/14362/u-wotn-misc-britains-mystery-boat.jpg?anchor=center&mode=crop&width=1000&height=500)
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Image Id: 220 Contributor: The Jordan/Ference Collection Theatre: The High Seas Subject: Surface Vessels Location: River Thames, London Regiment: P31 Service Arm: Navy Battle: Unknown Date: Unknown Combatants: British Publisher: Underwood & Underwood Source: British Directory: MISC