Blowing negativ tank loud?

[Gummi]

Hi. The laterst game im joining The mayority is using negativ tank when diving from surface to periscope deaph. This is not an emergency dive, just normal operation.

My point is that blowing that negativ tank submerge must be a strange och and load sound for any destroyers listen out there. So i prefer speed and dive planes only. But then crew yell att me to use negativ tank.
if its a crashdive I use it. But then we allready spotted so more sounds doesnt matter

My Question is.
does destroyers pick up sounds then you blow negativ tank
why use negativ tank IF you not spotted, only consume compress air