Why will many ships be destroyed in this meteor event?
The meteor will land in the ocean, evidently in an area where shipping lanes are located. Because it strikes the sea, a third of the sea becomes blood, a third of sea creatures die, and a third of shipping is destroyed. Many ships will be destroyed in that one event.
Les explains that this particular meteor will land in the ocean, evidently in an area where there are shipping lanes. As a result, a lot of ships will be destroyed in this one event. He connects this to the third part of the sea becoming blood, the third part of all creatures living in the sea that had life dying, and the third part of shipping being affected. He also notes that a later star falls upon the rivers and fountains of water, attacking fresh water. This reminds him of Egypt, where Moses caused the Nile to turn to blood, and the Egyptians dug wells for fresh water, only for the next plague to affect even the well water.