Dredgers, tugboats and even a backhoe failed to free a giant cargo ship wedged in Egypt’s Suez Canal on Thursday as the number of stacked-up vessels unable to pass through the vital waterway climbed to 150 and losses to global shipping mounted.

The skyscraper-sized Ever Given, carrying cargo between Asia and Europe, ran aground Tuesday in the narrow, man-made canal dividing continental Africa from the Sinai Peninsula. Even with the aid of high tides, authorities have been unable to push the Panama-flagged container vessel aside, and they are looking for new ideas to free it.

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