MTB 17 was almost certainly rammed by her own torpedo, which in this early model MTB was dropped over the stern. However there was no explosion.

And another looking south over Vlissingen. On the left is the Noorderbegraafplaats cemetery. The road heading away on the left is Van Dishoeckstraat and leads to the shipbuilding yard at the docks.
📷 IWM CL 1502 & Google Maps.

W3 sat in the woods behind the dunes and has been removed, flooded by the dyke breach and overgrown. There's a few scattered bits of concrete in the vicinity of the memorial on the dyke. maps.app.goo.gl/TVHNpohQNvg6...

A little more checking confirms that W1 was in the grounds of Fort de Ruyter: maps.app.goo.gl/fm2rrBo5LQ6w...

W2 I’ve actually been too. They’re reasonably well preserved positions

maps.app.goo.gl/RhDK2qDFkCyG...

Left W3, right W1

Actually probably not W4

Marine Flak Abteilung 810 were positioned around Flushing, specifically at W1, W2 and W3 strongpoints and probably W4.

Here’s a better photo of my time in the Arctic. I’m afraid I’m still on the road and won’t be back home for another 3 weeks, but I can check my sources then. I’ll try and look through my digital files before then, but it might be tricky on an iPad!

I haven’t I’m afraid, but I did visit Bluie West One in Greenland (as depicted in Masters of the Air). Currently sat in St John’s airport waiting to fly to Turkey.