The 2nd officer had crew members use a substance called sülyen to treat rust in the ship's bilge without proper ventilation. This exposed the crew to poison gas and caused one crew member to faint. While the 2nd officer's decision put crew safety at risk, it was made to address rust on the ship. In a second incident, the 2nd officer suggested painting a rusty cargo hold before inspection instead of properly preparing it, compromising safety standards for financial gain. The document discusses two instances where a ship officer prioritized tasks over crew health and safety.