Only three out of the four smokestacks were functional on the Titantic. The fourth was for looks.
"RMS Titanic" on @Wikipedia: "The interiors of the Olympic-class ships were subdivided into sixteen primary compartments divided by fifteen bulkheads which extended well above the waterline. Eleven vertically closing watertight doors could seal off the compartments in the event of an emergency.[39] The ships' exposed decking was made of pine and teak, while interior ceilings were covered in painted granulated cork to combat condensation.[40] Standing above the decks were four funnels, each painted buff with black tops, (though only three were functional—the last one was a dummy, installed for aesthetic purposes and also for kitchen ventilation)—and two masts, each 155 feet (47 m) high, which supported derricks for working cargo." @Curionic
#staycurious