if you choose to use 14.0m3 in the front MBT and keep the negative it will add unneeded steps when diving and consume a bit of compressed air.
As you have to, blow out the negative once submerged forcing you away from the dive planes, and you need th use compressed air to blow out the negative.
Easier to put all 18.5m3 in the front only. if you overflood, it is fine, just clear it to the appropriate level with the air vent, as described in the list above.
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