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HMS M1 (Cruiser Submarine)

HMS M1 was a Submarine of the Royal Navy and was part of a small class of Monitor or Cruiser Submarines launched in 1917. The Subs were fitted with a 12in (305mm) gun designed and fitted on many pre-dreadnought battleships of the era and could launch an explosive shell 14km (the rational being that at the time no sub had scored a torpedo kill on a warship outside of 1000 yards). Her sister ships HMS M2 (potentially coming soon) and M3 both had the guns removed (in 1925) with M2 refitted into an underwater aircraft carrier (could carry a small seaplane in a hangar that replaced the gun casing) and M3 a mine-layer.
HMS M1 sank with the loss of her entire crew in 1925 after colliding with a swedish vessel SS Vidar. The collision tore the gun from the hull and flooded the interior.(M2 also sank after her hangar door opened prematurely in 1932 and M3 was scrapped in 1927)

Features
-Detailed interior and exterior (I tried to get as close as i could to the real thing but the cutaway I found only shows certain parts)
-Fireable / reloadable main gun
-Depth hold and adjustable ballast controls
-Isn't as laggy as I had initially feared and runs just fine in the creative island dock

-New Feature - Torpedoes that track to a heading set in the control room (as well as a reload for the main tube)
Issues - Is a little harder to run due to the increased amount of logic but is still acceptable
-Requires large tanks to sink so can take a while to empty ballast
-Not 1/1 scale.The Width and Depth are about right but the length is way off (60m rather than 90m). This trade off makes it much more manegable to build and use.

Credit to ThomasBereens (SketchFab) for the 3D model that i used as the basis for the hull (and then spent 2 days ironing out to get it to look right!) and to R3 for the excellent Stormworks Hull Builder tool. I just couldn't get the hull shape right from scratch and the Type VIIC is close eough to make a good starting point. This is my first time using it and if you are willing to spend a bit of time working on the result it can be really nice.