Say the Japs had DEI & Phil, and its main force is at Carol Is. Ideally if you could get 5 allied subs in range you could spread them out in 5 different sz all at once costing Jap $ (8-10 ipc) and forcing them to buy more DD’s to go after you. At the very least it could be a stall tactic or weaken the Jap force. Jap would need to make a choice to attack your main force w/o DD’s (cheap causalities), or leave the convoy raids in place. If Jap goes after the subs, you may have created targets of opportunity to go after.
Submarine question
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if one sub attacks another sub, can the defending sub submerge before being shot at?
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Yes indeed.
When the attacking sub make his combat-move, the defending sub may choose to submerge or fight.
…unless there is an attacking destroyer too
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Really? I had no idea. How does that make sense? If one sub submerges to flee, the other could also submerge to pursue it. Is this true that subs can submerge against other subs?
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yes. they can disappear in to the dark deep sea and only the almighty destroyer can find them.