Old/PT Imp Group

Info

PT Imp Group No.637 Abyssal Class Patrol Torpedo Boat

Statistic
HP	9	Firepower	9
Armor	29	Torpedo	98
Evasion	'	AA	18
Aircraft	0	ASW	'
Speed	Fast	LOS	'
Range	Short	Luck	'
Equipment			Space
22inch Torpedo Mk.II			0
			0
-			-
-			-

PT Imp Group No.638 Abyssal Class Patrol Torpedo Boat

Statistic
HP	9	Firepower	9
Armor	29	Torpedo	98
Evasion	'	AA	18
Aircraft	0	ASW	'
Speed	Fast	LOS	'
Range	Short	Luck	'
Equipment			Space
22inch Torpedo Mk.II			0
22inch Torpedo Mk.II			0
-			-
-			-

PT Imp Group No.639 Abyssal Class Patrol Torpedo Boat

Statistic
HP	15	Firepower	15
Armor	29	Torpedo	98
Evasion	'	AA	18
Aircraft	0	ASW	'
Speed	Fast	LOS	'
Range	Short	Luck	'
Equipment			Space
22inch Torpedo Mk.II			0
22inch Torpedo Mk.II			0
-			-
-			-

PT Imp Group No.640 Abyssal Class Patrol Torpedo Boat

Statistic
HP	18	Firepower	18
Armor	39	Torpedo	118
Evasion	'	AA	24
Aircraft	0	ASW	'
Speed	Fast	LOS	'
Range	Short	Luck	'
Equipment			Space
22inch Torpedo Mk.II			0
22inch Torpedo Mk.II			0
-			-
-			-

Unlike most standard Abyssal enemies, the PT Imp Group is relatively small and fast. Attacking them with large-caliber guns will not do much damage; smaller guns are recommended to deal normal damage.
On 11/20/2015, a tweet revealed a bug that prevented destroyers from being able to hit the PT Imp Groups. As a result the devs readjusted the damage calculations in a live patch update on the same day.
The PT Imp Groups are vulnerable to attacks from destroyers, light cruisers, and ships equipped with secondary guns (refer to the List of Secondary Guns for more details).