Call it training. You obviously did everything right doring your approach, and attack. But got cocky during the evasion. Firing at that escort was not a good idea. Also, you should have been more stealthy once you thought you were safe. 2 knots and silent running is the rule. You got to remember ,those guys will call in for reinforcements and they get pissed when you sink their ships. When in areas heavily patrolled by aircraft, because of its slow diving time, the IX is vulnerable. It is a good idea to stay with decks awash while you recharge batteries. This cuts your diving time to 19 seconds.
Don't give up! Even dead, experienced skippers are hard to find