This is jargon. This information might help:
"Ten Ten Pier
In the Navy Yard at Pearl Harbor there was a row of three drydocks and running north east of Drydock No.1,a long pier, named after the length of the longest vessel the dock could hold, 1010 feet - Ten Ten Pier. Moored there were the light cruiser Helena and the minelayer Oglala. A torpedo passed under the minelayer and hit the cruiser."