Even after an attack, they'd likely not do so, certainly not while any escorts or ships with radios might be around. Why? Because then they would be known to still be alive.
You attack, the escorts dump a few DCs in a desultory attack. They go back and report to their bosses that they sunk you. Heck, knowing the IJN, they report sinking TWO subs! You are now safe.
If you surface and radio, then they know they didn't sink you (or think there is a 3d sub
) and either come back, or they call in air support in some areas. IJN doctrine regarding air was not all that bad. really. They'd indeed try and saturate an area and limit how far you could escape (since submerged you radius is quite small).
Anyway, the USN was not "chatty" which is a large part of the reason so few US subs were sunk. MANY German and Japanese subs were sunk because of their constant use of radio communications, it wasn't just codebreaking, plain ole DF would have done them in, too.