How many survivors were there of the disaster in which the MT Vector oil tanker collided with a ferry?
MT Vector: The Vector was a Philippine oil tanker that collided with the ferry "Doña Paz" on December 20, 1987 in Tablas Strait, Philippines, resulting in an estimated toll of over 4,000 lives. MV Doña Paz:  With an estimated death toll of 4,386 people and only 24 survivors, it remains the deadliest peacetime maritime disaster in history.
24