Thanks boys.... i had finished another mission yet now, and another time the hospital ship apears, it was in midle of the convoy, into a very dark night, it is very posible to hit it with a missed torp or with a homming one looking for a target.... i must to be ware about it.
Finally i remake that mission where i was "executed", not so lucky with merchants, at the first one i sunk 106000 tons, in the "remake" i sunk only 86000, but backing home, i found a "juicy" battle group, many DDs and DEs, 3 battleships and one carrier.
I was with only 7 torps, shoot 2 to a Nelson class and it was done... + 36000 !
Another 3 to a King George class and it take a lot of time to sink but done... + 35000 !! the remaining 2 torps was not enought to sink the remaining Revenge class. it go far with 2 torps inside, and its bow underwater, when finish the mission was not credit for it, the ship survive.... 35000 losed !!! Arjh!!

i waste a torp some hours before to sink an alone DD....
Experience : .... " do not Waste a torp into an stupid DD, you will need this torp in the future !!! "