Simplify the following text for a Grade 7 native English-speaking person.
Original: The object struck by the Explorer caused a 10 by 4 inch ( 25 Ã -- 10 cm ) hole to the ship 's port side ( left side ) which allowed sea water to enter the ship .
Simplified: The object struck by the Explorer made a reported 10 b gash in the hull which allowed water to enter .