Ship refill gear and home fixtures stay aboard. Preparing with a reusable part does not consume it: the player may reclaim it before departure unless they deliberately leave it installed, which the manifest shows. No reusable home tool must be abandoned to manufacture a packing cost.
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For one legible opening example, propose **ten carrying units** and **four one-part rig spaces**. The opening rig’s Threat Sensor, Pulse Projector, Manual Trigger and Barrier Plate occupy all four rig spaces and four carrying units. Ship storage begins with two refillable portable vessels; the player may carry one or both. A canister occupies two carrying units whether ordinary-full, prepared-full, partial or empty; the isolation bridge occupies two; the loose Fork Relay occupies one. None of these quantities is selected.
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For one legible opening example, propose **ten carrying units (10 C)** and **four one-part rig spaces (4 A)**. The opening rig’s Threat Sensor, Pulse Projector, Manual Trigger and Barrier Plate each use proposed **1 C / 1 A**, occupying all four rig spaces and four carrying units. Ship storage begins with two refillable portable vessels; the player may carry one or both. A canister occupies proposed **2 C** whether ordinary-full, prepared-full, partial or empty; the isolation bridge occupies proposed **2 C**; the loose Fork Relay occupies proposed **1 C / 1 A** when active. None of these quantities is owner-selected or tuned.
Four occupied rig spaces make the required immediate lesson **carried versus infrastructure-installed**, but still allow optional rig experimentation. At Cargo Turn the player may move Manual Trigger to inactive cargo, fit the Fork, and try **Threat Sensor → Fork → Pulse Projector + Barrier Plate**. That branch replaces manual barrier timing with sensor-triggered behavior and costs a world-time edit; it is different, not an instant upgrade. Keeping the Fork packed preserves the later branching opportunity selected opening A allows. A fifth space would hide this active-area cost, so four remain proposed.
@@ 18,13 18,13 @@
## Portable oxygen contract
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The suit tank is the active breathing supply. A carried canister is reserve gas, not a second automatically draining tank. The player deliberately couples one canister to the suit; gas transfers while world time and threats continue. The display shows tank level, the selected canister’s remaining level, transfer progress and current shared capacity. Coupling follows Combat Rules’ staged-action interruption contract: damage alone does not cancel it; explicit cancel, displacement out of reach, loss of the coupling, or an occupied control does. Any interruption preserves the incremental result below.
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The suit tank is the active breathing supply. Under the accepted first-pass quantities in [Mechanical Interfaces And Opening Quantities](/Hold%20The%20Flood/Mechanical%20Interfaces%20And%20Opening%20Quantities), propose a **12 O** suit tank, an ordinary **8 O** canister, a bench-prepared **12 O** canister, base breathing of **1 O per 30 seconds**, and transfer of up to **3 O per 30 seconds**. A carried canister is reserve gas, not a second automatically draining tank. The player deliberately couples one canister to the suit; breathing and transfer run continuously while world time and threats continue. The display shows exact tank level, the selected canister’s exact remaining level, transfer progress and current shared capacity. A player-set reserve reference defaults to **4 O** but is never a route estimate. Coupling follows Combat Rules’ staged-action interruption contract: damage alone does not cancel it; explicit cancel, displacement out of reach, loss of the coupling, or an occupied control does. Any interruption preserves the incremental result below.
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Transfer is conserved and incremental. If interrupted, the suit keeps only the amount already transferred and the canister keeps the remainder; neither duplicates or vanishes. A full, partial or empty canister keeps the same carrying size because the physical vessel remains. An empty vessel can be brought home for free refill, dropped at a known place, or used by a separately authored station fixture. No general fixture use or canister consumption is assumed here.
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Transfer is conserved and incremental. It stops immediately when the suit reaches **12 O** or the selected vessel reaches **0 O**; ordinary breathing continues, and gas that could not transfer stays in its vessel. Thus starting at suit **11 O** and canister **5 O**, after 15 seconds the suit is **12 O** and the canister **3.5 O** (0.5 O breathed and 1.5 O transferred); transfer then stops, so another 15 seconds of breathing leaves suit **11.5 O** and canister **3.5 O**. If interrupted, the suit keeps only the amount already transferred and the canister keeps the remainder; neither duplicates nor vanishes. A full, partial or empty canister keeps the same carrying size because the physical vessel remains. An empty vessel can be brought home for free refill, dropped at a known place, or used by a separately authored station fixture. No general fixture use or canister consumption is assumed here.
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Aboard the ship, the player may connect the suit tank and any canisters in storage to the ship’s unlimited oxygen supply. Refill costs no scarce oxygen, currency, charge or maintenance resource. It may be stopped and resumed, leaving an honestly shown partial fill; the safe ship context adds no expedition pressure. Before departure, the manifest distinguishes full, partial and empty vessels rather than replacing them with an abstract total.
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Aboard the ship, the player may connect the suit tank and any canisters in storage to the ship’s unlimited oxygen supply. Refill costs no scarce oxygen, currency, charge or maintenance resource. It may be stopped and resumed, leaving an honestly shown partial fill; the safe ship context adds no expedition pressure. Before departure, the manifest distinguishes the proposed **8 O ordinary-full**, **12 O prepared-full**, exact partial and **0 O empty** states rather than replacing them with an abstract total.
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[Home Projects](/Hold%20The%20Flood/Home%20Projects) also proposes **bench-prepared canisters** with more usable oxygen than an ordinary fill at the same carrying size. Treat ordinary-full and prepared-full as distinct visible fill states. If a prepared canister is partly used, an ordinary ship refill adds only enough oxygen to reach the ordinary-full level; it never vents an above-ordinary remainder, erases it, or restores the already consumed prepared surplus. Only another completed powered-bench preparation restores prepared-full. The improved fill remains in the vessel after its relay is reclaimed and follows the same carried, dropped and interrupted lifecycle as any canister.
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[Home Projects](/Hold%20The%20Flood/Home%20Projects) also proposes **12 O bench-prepared canisters** at the same **2 C** vessel size as the **8 O ordinary fill**. Treat ordinary-full and prepared-full as distinct visible fill states. If a prepared canister is partly used, an ordinary ship refill adds only enough oxygen to reach 8 O; it never vents an above-ordinary remainder, erases it, or restores the already consumed prepared surplus. Only another completed powered-bench preparation restores 12 O prepared-full. The improved fill remains in the vessel after its relay is reclaimed and follows the same carried, dropped and interrupted lifecycle as any canister.
Breath and combat resources remain separate. Receiving oxygen does not heal suit condition, restore a weapon instantly, fill a Capacitor, create a trigger, reset a causal wave, refresh a barrier or power station machinery. During a field transfer, normal world time passes, so a weapon’s ordinary readiness may progress according to its own rule; the oxygen transfer did not cause that progress. Under Combat Rules’ bounded baseline, returning alive or reviving aboard restores ordinary condition for the next expedition; field healing and lasting injuries remain open. A canister affects another system only when a later authored mechanism explicitly says what is connected and what is spent.
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## Uncertainties, effort and later evidence
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Still open are the true capacity model and rig geometry; tank and canister sizes, transfer rate and readable return margin; the starting loadout; objective-item sizes; field-refill vulnerability; field healing and lasting injuries; which fixtures accept oxygen; alive-return world behavior; and the presentation of partial/prepared vessels. [Player Information](/Hold%20The%20Flood/Player%20Information) is now a preparation-closed **proposed** interface input: its continuous oxygen/capacity display, atomic pickup feedback and carried/installed labels are useful dependencies, not owner-selected rules.
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Still open are the true capacity model and rig geometry; alternatives or tuning to the proposed tank/canister/transfer quantities; the starting loadout; objective-item sizes; field-refill vulnerability; field healing and lasting injuries; which fixtures accept oxygen; alive-return world behavior; and the presentation of partial/prepared vessels. [Player Information](/Hold%20The%20Flood/Player%20Information) is now a preparation-closed **proposed** interface input: its continuous oxygen/capacity display, atomic pickup feedback and carried/installed labels are useful dependencies, not owner-selected rules.
**First-pass planning envelope, from assignment through one focused review and this bounded response:** Systems authoring 6–10 active role-hours, Reviewer 3–5, Systems response 2–4; **11–19 role-hours total**. The 6–10 author range maps inside the Whole Game Outline’s 6–12 **author-only survival** allowance. Review and response were additions for this package, not a second copy of that allowance or of the outline’s separate coherence-review row. These are planning estimates, not logged labor; after this response, no further Systems work is implied before PM disposition.
