Thank you letting me know that, I just edited the sound myself using audacity, exported the file in wav, renamed the file extention to spr, not sure if this works, will test it later.
Below are some sound files I found.
ADSND, old sound, can not fire even if you cleared the board, we are sinking, enemy ship in sight, mayday mayday, etc
EFBT, gun fire sound and the last one is HH explosion sound
EFIT, sailor in harbor
EFITVC, ready sir
EFWPFT, sound when sheel hit ship/water
EFWPFTAC, flying, take off, ??
EVTSTSND, event sound? not working
HCBSND, harbor assult sound
NEWSND, new sound