I have a lot of SH3 snorkel time in both Type VII's and IX's but know nothing about Toyotagt86's mod. So:
1. Can the Type IXB even be fitted with a snorkel? The VIIB cannot so perhaps there is a disconnect between the snorkel and the model. Without more data, I suspect that this may be your issue. A quick look at Uboats.net indicates that only the VIIC, VIIC/41 and IXC and IXC/40 received snorkel upgrades.
2. Does the Mod use HSie's patch? If so, check the snorkel setup values. If these are set too low, that might be a problem but one should expect an error message in the message window.
3. Does the oxygen in the boat reset? This should happen within five minutes and if it does not, see comment 1 above.
Anyway, good luck. Make sure that you have Map Contacts "ON" for snorkelling otherwise you will never see the planes that will kill you.
-C
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