Question 1378

 Let A be the ship onthe ocean surface,andBbe the sunken ship
 as diagram below. 
   A--------C
   |\
   | \
   |  \
   |   \
   |    \
   |     \
   P      B     Angle BAC is the angle of depression 
   
 Since AB = 200 m and Angle ABP = Angle BAC = 50 deg

 Hence, the vertical distance AP = 200 sin 50 = 153 meter...Answer