Final answer:
The first event that happened was the radio room receiving ice warnings. This was followed by water pouring into the ship, the lowering of the first lifeboat, and finally, Jack Thayer climbing into a lifeboat.
Step-by-step explanation:
The sequences of events are critical when discussing the sinking of the Titanic, to which the question alludes. The correct order of events is that the radio room received ice warnings first, followed by water pouring into the ship as it struck an iceberg. Then, the first lifeboat was lowered, in an effort to save passengers and crew. Finally, well-known Titanic survivor Jack Thayer climbed into a lifeboat, escaping the disaster.