▁capabilities ▁were ▁recogn ised . ▁ ▁Ac com pl ish ments ▁of ▁the ▁T all boy ▁included ▁the ▁ 2 4 ▁June ▁ 1 9 4 4 ▁Operation ▁Cross bow ▁attack ▁on ▁La ▁Cou pole — al ong ▁with ▁Grand ▁Sl ams — which ▁und erm ined ▁the ▁found ations ▁of ▁the ▁V - 2 ▁assembly ▁b unker ; ▁and ▁a ▁T all boy ▁attack ▁on ▁the ▁Sa um ur ▁tunnel ▁on ▁ 8 – 9 ▁June ▁ 1 9 4 4 , ▁when ▁bomb s ▁passed ▁straight ▁through ▁the ▁hill ▁and ▁expl oded ▁inside ▁the ▁tunnel ▁ ▁below ▁the ▁surface . ▁ ▁The ▁last ▁of ▁the ▁Kriegs marine ' s ▁B ism ar ck - class ▁batt les hips , ▁the ▁Tir p itz , ▁was ▁s unk ▁by ▁an ▁air ▁attack ▁using ▁T all bo ys ▁in ▁Operation ▁C ate ch ism . ▁ ▁Design ▁Most ▁large ▁Al lied , ▁particularly ▁British , ▁World ▁War ▁II ▁aircraft ▁bomb s ▁( block b uster ▁bomb s ) ▁had ▁very ▁thin ▁sk ins ▁to ▁maxim ize ▁the ▁weight ▁of ▁explos ive ▁that ▁a ▁bom ber ▁could ▁carry . ▁This ▁was ▁an ▁improvement ▁on ▁the ▁early ▁part ▁of ▁the ▁war ▁when ▁the ▁explos ive ▁content ▁of ▁British ▁bomb ▁designs ▁was ▁low . ▁ ▁To ▁be ▁able ▁to ▁pen et rate ▁the ▁earth ▁( or ▁hard ened ▁targets ) ▁without ▁breaking ▁apart , ▁the ▁cas ing ▁of ▁the ▁T all boy ▁had ▁to ▁be ▁strong . ▁Each ▁was ▁cast ▁in ▁one ▁piece ▁of ▁high -