Compressed air reserves are not the same as the oxygen level?

[Thirium 310]

So if the oxygen in the boat is full and the reserve oxygen reach 0% there is still no danger?

[Frank Machin]

You need comtessed air but not for breathing.
To get a submarine to surface, the main vents in the top of the tank are closed and high-pressure compressed air is blown into the ballast tanks, forcing the water out through the flood ports at the bottom of the tank.
This increases the vessel's displacement.

[Fidelity]

The oxygen level is what the crew breathes. The compressed air is part of the ballast system which controls the ships buoyancy.

[Jackrabbit_V6/ RSProduxx]

in easy words: you put air in the tanks to make the boat light, for surfacing...
you blow air out to take water in, makes the boat heavy to dive...
so without compressed air you can´t get up if you´re under water

that´s the easy explanation... of course there are nouances in between those 2 states :)

[Metallos]

The O2 symbol is misleading, it's falsely used for the pressured air and not for oxygene.

[Kyrah Abattoir]

It should be for both I believe (if it was realistic).

[wolf310ii]

Originally posted by Kyrah Abattoir:

It should be for both I believe (if it was realistic).

No it was not for both, they had compressed air for the boat and compressed O2 for the crew.
Its very ineffective to rise the O2 level with compressed air

[r4y30n]

On the note of O2, has anyone tried the ventilation in the engine room? I kept wondering why I only had an hour of air when submerged then tried kicking on the ventilation and it fills your O2 while running. Seems like a cheat at the moment unless there’s some limitation I’m missing.

[Xivios]

Originally posted by r4y30n:

On the note of O2, has anyone tried the ventilation in the engine room? I kept wondering why I only had an hour of air when submerged then tried kicking on the ventilation and it fills your O2 while running. Seems like a cheat at the moment unless there’s some limitation I’m missing.

There are scrubbers that can be added to it but right now they don't seem to actually do anything, presumably they'll be enabled and the infinite O2 while running ventilation will be scrapped once they've got them balanced and properly integrated into the game.

Or perhaps they're already intended to be a functional part of the game and the system is currently bugged.

[Thirium 310]

Originally posted by Metallos:

The O2 symbol is misleading, it's falsely used for the pressured air and not for oxygene.

Yeah indeed. I thought that compressed air was oxygen reserve.

[Thirium 310]

Originally posted by r4y30n:

On the note of O2, has anyone tried the ventilation in the engine room? I kept wondering why I only had an hour of air when submerged then tried kicking on the ventilation and it fills your O2 while running. Seems like a cheat at the moment unless there’s some limitation I’m missing.

Yeah I tried the ventilation and it gives you much oxygen but it uses much power

[Jackrabbit_V6/ RSProduxx]

Originally posted by Frozen Weed Marshmallow:

Originally posted by r4y30n:

On the note of O2, has anyone tried the ventilation in the engine room? I kept wondering why I only had an hour of air when submerged then tried kicking on the ventilation and it fills your O2 while running. Seems like a cheat at the moment unless there’s some limitation I’m missing.

Yeah I tried the ventilation and it gives you much oxygen but it uses much power

and it makes noise like crazy... impossible to use it when like 5 miles away from possible victims... they hear it and run off (or attack) :)

[Thirium 310]

Originally posted by Jackrabbit_V6/ RSProduxx:

Originally posted by Frozen Weed Marshmallow:

Yeah I tried the ventilation and it gives you much oxygen but it uses much power

and it makes noise like crazy... impossible to use it when like 5 miles away from possible victims... they hear it and run off (or attack) :)

The victims are actual easy :) most of the time there are just transport ships and if you face Corvettes‚ just dive so that they can't hit you. But I never faced a plane yet. That is weird because I already have 16 hours. Where are the enemy aircraft?

[Jackrabbit_V6/ RSProduxx]

i had 2 encounters with aircraft so far... 1 at the "deliver a spy" mission, because i had to wait outside a bit to refill my batteries and suddenly patrol boats and aircrafts arrived above that harbor... and a second one close to la rochelle when i returned from a mission... they were just there out of nowhere, no chance to react... Needless to say i didn´t survive either encounter... :)

[Thirium 310]

Originally posted by Jackrabbit_V6/ RSProduxx:

i had 2 encounters with aircraft so far... 1 at the "deliver a spy" mission, because i had to wait outside a bit to refill my batteries and suddenly patrol boats and aircrafts arrived above that harbor... and a second one close to la rochelle when i returned from a mission... they were just there out of nowhere, no chance to react... Needless to say i didn´t survive either encounter... :)

So you there are aircrafts near enemy harbors? Or are there enemy airports on the map? That icon with a hangar on the map I mean

[ждун]

as others already mentioned compressed air is not what you breath, its what you use to control balast.

in reality the crew was breathing the air what was captured inside the hull.
normal fresh air has about 20% of oxyben, and 0.04% co2

when being breathed oxygen level sinks, while co2 level raises after certain time reaching critical values. CO2 becomes toxic at about 1.5% and would be reached much sooner then then oxygen would become an issue.

a real VII submarine hull has about 400m³ volume of air. For a standard crew of 37 members it took about 5 hours before co2 levels became critical. Using co2 scrabbers co2 could be removed in certain degree. Additionaly they had an option to increase oxygen level using bottled compressed oxygen. A combination of co2 scrabbers and oxygen bottles they were able to remain submerged up to 72 hours.