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Lore: (ONLY FICTIONAL)
Project SURCOUF-M – “The Walking Cruiser”
(Unofficially “The Submersible Monster” or simply “Surcouf-M”)
France’s answer to the heavy walkers of the other powers was the most radical of all: they took the unique cruiser-submarine Surcouf — once the largest submarine in the world — and rebuilt her as a multi-legged, semi-submersible artillery platform. The goal was not merely to match the Soviet Object 705, British TOG-M, Japanese O-I-M, or American Citadel, but to out-range and out-hide them.Standing approximately 30 feet (9.1 m) tall from footpads to the top of the conning tower (taller still with the periscope fully extended), the Surcouf-M is a compact but imposing machine. The twin 203 mm/50 Modèle 1924 guns were retained at their original cruiser length of 33.3 feet (10.15 m). These true naval barrels fire 123–134 kg armour-piercing or high-explosive shells at 820–850 m/s, reaching maximum ranges of 28–31.4 km depending on elevation and charge. Even at the more limited +30° elevation inherited from the submarine mounting, effective range remains approximately 28 km. The heavy shells deliver devastating kinetic and explosive effect, fully capable of threatening or penetrating the frontal armour of most contemporary heavy walkers at medium-to-long range, and of destroying lighter machines or fortifications outright.The turret itself does not rotate freely. The entire walker must turn to change primary bearing, though the guns retain limited lateral adjustment and full elevation/depression. This simplification saved weight and internal volume while allowing significantly thicker armour than the original submarine pressure hull. The compact, heavily plated body and legs give the machine far better protection against shellfire and fragments than Surcouf ever possessed on the surface. It can shrug off hits from most medium guns (47 mm, 57 mm, 75–76 mm, early 88 mm) and glancing or long-range fire from heavier weapons. However, sustained or close-range impacts from the true super-heavy guns — the British 18-inch, the American 8-inch howitzer, the Austrian Paris Gun, the Soviet 152 mm on the Object 705, or the Japanese 105/150 mm on the O-I-M — will eventually breach even its reinforced plating, especially on the legs or rear.Tactically the Surcouf-M is a submersible long-range artillery platform. It can remain completely hidden on the seabed just off an enemy coastline, raise its ultra-tall panoramic periscope to obtain firing solutions, and deliver heavy-cruiser salvos onto inland targets. Once its position is revealed it can walk along a sea trench or climb onto land to reposition. Because of the enormous recoil of the full-length 203 mm guns, accurate fire is only possible when the machine is stationary: the heavy-toothed footpads must be firmly planted and the hydraulic leg clamps locked to absorb the shock .In direct comparison with the other heavy monsters:
Against the Soviet Object 705, British TOG-M, and Japanese O-I-M it possesses superior or equal gun range and shell weight, giving it a clear advantage in a long-range gunnery duel, provided it can remain planted and protected. Its armour can absorb a limited number of their hits but will not survive a prolonged close-range exchange.
Against the American Citadel and Bastion series its 203 mm shells are a severe threat, while its ability to fire from underwater or coastal cover offers unique tactical options those pure land machines lack. Its protection is roughly comparable to the better-armoured American heavies against medium-caliber fire.
Against lighter mass-produced walkers it is simply overmatching in firepower and can ignore most of their return fire.
Its weaknesses remain the same as its strengths: it is slow to reposition, completely vulnerable while moving or unlocking its legs after firing, has no rear-facing weapons, and relies heavily on its periscope and submerged stealth to survive. Once forced into a close-range brawl on open ground it becomes a large, high-value target whose armour, while much improved over the original submarine, is still not in the same class as the pure land superheavy . One hundred years later the few surviving Surcouf-Ms remain the most unusual of the old monsters — part submarine, part walker, part coastal fortress. They still haunt coastlines and river mouths, rising from the water only long enough to deliver a crushing 8-inch barrage before disappearing again beneath the surface . It was built from the largest submarine of its age.
Its full-length 203 mm guns can reach and hurt every other heavy walker, and its reinforced armour can take a surprising amount of punishment before failing.
And it still rises from the sea.