Torpedo reference (.pdf) - Danger from the deep

un and a long loop.
If s ubm arine is to port or s tarboard of th e convoy a m e dium to long
pre lim inary run according to s ignal s tre ngth on h ydroph one s , and
long loop.
e ) In orde r to e ns ure gre ate s t pos s ible s ucce s s in th e e ve nt of a blind
attack torpe doe s in a l tube s m us t be fire d.
It m us t be re m e m be re d h ow e ve r th at unle s s th e Z aunk önig is fire d in
q uite a diffe re nt dire ction, an inte rval of at le as t 10 m inute s m us t
e laps e be tw e e n it and th e firing of F.A.T. torpe doe s .
f) In firing non-contact pis tol boat m us t dive to 40 - 50 m e te rs
im m e diate ly afte r firing in orde r to be s afe from e xplos ion of torpe do
pas s ing ove rh e ad. It is th e re fore be s t to fire in th e s h orte s t pos s ible
tim e e ith e r a fan or q uick ly s ucce s s ive s ingle s h ots .