From: C.T.U. 22.7.1 To    : C.T.G. 22.3     Subject: Sub Kill, U546.
	1.        We have learned a lesson; that when in waters where subs are reported to be, every sonar contact must be treated as "probable" and investigated most carefully.  Echos were weak, mushy, and ranges short most of the times during the day.  Sound conditions were very good, bathythermograph readings indicating assured range of 2000 yards.  Poor echos due to deep submergence every time we got anywhere near him.  Several readings taken with 147-B depth finding gear showed 450 to 600 feet.  Lost contact four or five times during day, for periods of from thirty minutes to an hour and a half.  Held sweep line in readiness at all times, in close proximity of contact, to pass thru area in case of lost contact.  Never failed.  Coordinated attacks, with assist ship concentrating on holding contact absolute necessity.  Quail did excellent job at this.  Foxer completely blanked out echoes, had to secure when making attacks.
	2.        Davis was investigating doubtful contact when she was torpedoes.  Torpedo apparently hit forward engine room space just off of bridge superstructure.  She broke in two, folded up and sank in less than five minutes.  Started sweep search immediately.  Flaherty ordered to pick up survivors.  Flaherty got contact while working on survivors and left immediately to develop.  All sweep line group called in and they arrived within one to two hours.  Kept after him with H/H when indications were that he was shallow and creeping attacks when deep.  No direct hits but undoubtedly shook him up considerably.  In late afternoon lost contact for about 1 3/4 hours.  When located again found he was running shallow, about 200 feet.  Started in with H/H, Flaherty attacking, Quail assisting.  Think we got a hit on second attack at this time, got definite oil slick.  While squaring away for third attack sub surfaced.  Opened fire immediately, four or five ships simultaneously.  Sub crew abandoned at once, came out wearing life jackets and carrying rafts which were inflated at once.  Sub sank within five minutes, went down by the head at sharp angle.  Ships went in and picked up survivors, maneuvered alongside rafts, could not use boats rolling excessively.
	Davis dept, paid in part.
	M. HALL