When Annabeth was attacked by the Manticore, they both got thrown over a cliff's edge during a skirmish. She was caught by Luke and the General who was known as the person working closely with Kronos. Artemis later explains how she tried to save the people but she couldn't save Annabeth but she urges other gods to help them.
Answer
Coal spontaneously combusted
Explanation
There are many theories for the cause of the United States the USS Maine explosion with Us men aboard where many died. According to the United States Naval Investigative team team their research concerning this incident , they came to a conclusion that the explosion was caused by fire that had ignited the ammunition stock. According to these investigators there was a strong evidence that the explosion of Maine was caused by an internal coal fire which ignited the magazines. This was a likely cause of the explosion, rather than the initial hypothesis of a mine
It was a bad storm and the storm cracked the ship. It caused a leak that threatened to sink the ship. Hope it help!!