UBOAT Historical Realism Pack

PLAYTEST — not recommended for a regular campaign yet. Expect bugs with other mods. If you hit issues, clear your UBOAT cache and resubscribe.

Do not use DLSS with this mod yet. It is not currently compatible and can cause visual issues. DLSS support is planned for a future update.

• Active-watch sailors hold their duty stations. Reserve crew only backfill cleaning, galley, and side jobs when nobody is on watch, after a shift-transition grace.
• Sleep is protected. The routine never pulls a sleeping sailor back to work.
• Your custom crew schedules and task priorities stay authoritative on load.
• Officer squad following, overwork discipline, and per-job watch-coverage checks.

• Organized rolling swell in steady wind, confused cross-seas after a wind shift. The sea reads like real water, not noise from every direction.
• Bigger open-ocean waves with real breaking crests, not flat rounded water.
• Ambient ocean whitecaps return from Beaufort 4 upward.
• Long ocean swells roll through even in calm. A persistent distant-storm swell instead of flat glassy water.
• Twenty one regional water profiles tuned to real ocean optics.
• North Sea and Western Approaches keep their green teal turbid character. Caribbean, Red Sea, Mediterranean keep their clearer baseline.
• Submerged sub silhouette through the surface dialed back. No more glass clear water.

• Surface roll restored. PlayWay’s lateral force factor halved roll torque before. Fixed.
• Calibrated to Buchheim’s U-96 storm notes and Das Boot’s 40 degree platform rating.
• Beaufort aware damping. Calm seas stay calm, storms get violent.
• Voxel hull sampling restored so beam waves generate real roll torque.
• Center of mass lowered for proper pendulum weight.
• Submerged drift on four named Atlantic currents, thermocline pull, Bernoulli seabed suction.

• Multi-day weather systems. Rough and calm spells build and hold for days, paced by region and season, instead of flickering hour to hour.
• Storms bring weather. Fronts cloud the sky over, bring rain, and can break into thunderstorms. No more permanent fair weather.
• Storms grow the sea you actually sail in, not just the forecast number.
• Climate runs by theater and month. North Atlantic winter turns genuinely foul, Mediterranean summer stays milder. Caribbean storms throw thunder at six times the Atlantic rate, the Arctic does not thunder.
• Forecast horizon truncated to 24 hours like real WWII forecasts.
• Snorkel head valve closes when waves wash the mast above Beaufort 4 to 5.

• GHG raw range recalibrated. 20 km single ship, 100 km group, before downstream modifiers.
• Rain cuts hydrophone range per real ambient ocean noise curves.
• Two custom sonar ping samples. Main 95 percent, rare variant 5 percent.

• Near miss hidden flaw chances on hatches, trunks, valves, pipes, pumps, periscopes, and snorkels retuned to match historical loss patterns.
• Crash dive equipment flaw rates rebalanced.
• Custom underwater explosion audio with proper bass.
• Distant depth charge rumble audible 50 to 150 km out, frequency band modulated.

• Realistic reload times by boat class, crew skill, headcount, and perks. Internal tubes reload in minutes (never over 30), external deck reloads stay a long surfaced-only job.
• Torpedo Crisis 1939 to 1942 shipped as seven date gated patches.
• Magnetic pistol unreliability tracks historical defect rate.
• Depth keeping bias matches BdU patrol log analysis.
• T5 acoustic homing speed window enforced.
• G7e battery preheat required for cold water firing.
• BdU dispatches and doctrine changes through the Dönitz versus ordnance fight.

• Oxygen consumption scales to real crew count and activity.
• Potassium absorber duration retuned to historical CO2 scrubbing rate.
• Potassium absorber shop price floored at 10 RM. Stock raised at friendly ports. Lorient and Helgoland always carry them.
• Trim pump capacity rebuilt per class. Type II coastal slower than Type VII slower than Type IXC ocean going. Vanilla shipped them all identical.

• Thermocline hides you now. Shallow in summer (mid Atlantic around 50 m), deep in winter (Norwegian Sea around 190 m), pushed deeper by storms.
• Type VII at 70 to 80 m on a summer Atlantic patrol gets the full historical detection cut at safe depth.
• AI U-boats hide under the layer instead of resting on the seabed.
• Funnel smoke spots out to 25 to 30 nm in clear weather.
• Deck guns useless above Beaufort 5.

• ASDIC escorts cap at historical 12 knot search ceiling. They slow down to hear you.
• Hunter groups peel off escort screens when convoys take hits.
• Escorts detach to wounded merchants before resuming convoy duty.
• Convoy formation type varies by lane. HX, SC, PQ, JW each ship in historical formation.
• HF/DF triangulation gates by era.

• Squadron and era search patterns. RAF Coastal Command creeping line, USN VP-63 expanding square, both from 1942.
• Aircraft endurance and RTB behavior, coordinate with surface escorts on convoy attacks.

• BdU and Allied Admiralty both run independently. Both sides track losses, allocate reserves, surge into hot zones.
• CVE deployment, Eastern Fleet rebuild, Brazilian entry, Black May 1943 all on the strategic timeline.

• Custom sonar pings, depth charge bass, torpedo underwater explosions, aircraft MG audio (Bren .303, MG42) with close/mid/far/distant variants.
• Bow wash, hull lapping, settling creaks scale with sea state. Underwater ambient shifts with depth and weather.

• 23 named historical convoy lanes (HX, SC, ON, PQ, JW, RA, OS, SL, OG, HG, KMS, MKS, AT, GUS, CU, TM, etc.) on top of standard traffic.
• ~1,800 real merchant identities. Liberty 4-685, Coaster 0-439, Empire class 332-1,407.
• Per port cargo by trade pattern. Curaçao oil, Cardiff coal, Liverpool food/ammo, Freetown rubber, Murmansk PQ/JW supplies.
• Operation Neuland surges Caribbean from Feb 1942. Italy flips at Cassibile Sept 1943. Indian Ocean monsoon writes off six months a year.

• Warm tungsten 2700 K interior baseline. Type VII and IX boats never had blue lighting.
• Compartments dim by historical tier. Engines brightest, quarters dimmest.
• Red interior on silent running with full noise and oxygen modifiers preserved.
• Day submerged battle stations fade white lights to preserve dark eye adaptation.

• Per region sky across 8 climate clusters. North Sea overcast, Arctic dark navy, Tropical haze, Mediterranean clear.
• Surface ocean colors photo-anchored: Bay of Bengal teal-green shelf, Indian Ocean cobalt, Arctic deep dark navy.
• Above water effects: color grading, vignette, chromatic aberration, god rays, storm horizon darkening.

Tested: UBOAT 2026.1 Patch 20. Install: Subscribe, enable in launcher, accept the Reflection and IO permission prompt. Attribution: Original work or CC BY SA 3.0 (Wikipedia ship class lists).