BALTIMORE (AP) — Officials in Baltimore plan to open a deeper channel for commercial ships to access the city’s port starting on Thursday, marking a significant step toward reopening the major maritime shipping hub that has remained closed to most traffic since the Francis Scott Key Bridge collapsed last month. The new channel will have a controlling depth of 35 feet (10.7 meters), which is a substantial increase over the three other temporary channels established in recent weeks. It puts the cleanup effort slightly ahead of schedule as officials previously said they hoped to open a channel of that depth by the end of April.