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From the linked Non-Possumus website (FSSPX ѕυιcιdє Chronology):
CRONOLOGÍA DEL SUICIDIO DE LA FSSPX
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Technical problem: the smokestack on the right shouldn't have any smoke rising out of it because the Titanic had only 3 functional stacks, the first three in front. The last one in the stern was fake, just there for looks, because the profile of the ship didn't look balanced without the 4th stack. Witnesses said they saw that last smokestack fall off as the ship was sinking. It probably killed a number of people when it fell, perhaps even in lifeboats.