Peter Madsen has explained that a defect on a submarine valve made it difficult to operate, just as he did not follow the necessary procedure on launch after diving on August 10 last year.
He has calculated three scenarios where drain valve 3 was open and hull valve 4 was respectively 1) completely closed, 2) fully open, 3) partially open.
The conclusions are reproduced in a legal book of 12 March.
Conclusion on scenario 1:
The underwater boat will not be manually opened after less than 40 seconds with closed hatch and that the engine room is toxic due to carbon dioxide (and possibly carbon monoxide) after just two and half minutes. The entire boat may be toxic after eight minutes. As mentioned above, carbon monoxide is not taken into account, which could further aggravate the situation.
Conclusion on scenario 2:
In this case, the pressure on board will fall very quickly and a situation like scenario 1 will occur in a short period of time. Due to the low pressure, carbon dioxide concentration will become more toxic soon (about 5% vol) and there will be increased danger due to the simultaneous decreasing oxygen partial pressure. In this scenario, the time at which the lid can be opened manually will be reduced from less than 40 seconds to less than 10 seconds, as the outflow is good 4 times higher.
Conclusion on scenario 3:
Based on the calculation of carbon dioxide emission and loss of pressure from Scenario 1 and 2, it can be concluded that regardless of the unknown position of valve 4, the possibility of opening the submarine's hatches is manually lost after 40 seconds and possibly even before. Based on the same one can conclude that the atmosphere in the engine room has become toxic for less than two and a half minutes, especially in the zone between the two engines, as the exhaust zone is located here. After opening the engine door, the rest of the submarine's atmosphere will be destroyed less than eight minutes after the air closure. However, it is unlikely that it has been going on for so long.
https://ekstrabladet.dk/112/live-ek...-ikke-raabe-til-madsen-gennem-ubaaden/7100998