I only use the negative tank and dive planes for depth control (thats why there are 2 wheels for blowing and flooding the negative tank without having to blow the main tanks) . I only blow the main tanks if i want to completely surface . So as soon as i get to the surface i flood the negative tank for when i need to crash dive . If i want to dive i flood the main tank and when i have reached the desired depth i blow the negative tank . If i need to dive quickly i will flood the negative tank again and then blow the negative tank when i have reached the desired depth .
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