Board Thread:General Discussion/@comment-24020554-20131006193406/@comment-17733617-20131007062555

They probably had 2 destoyed Super Fortress with the 3 DNX.

A Super Fortress with Level 1 Retrofit can hold 5,872,018 cargo. (11,744,036 for 2 Super Fortress)

A DNX can hold  551,483 cargo. (1,654,449 for 3 DNX)

That is a Total of  13,398,485. And since you can hold 500% cargo from a base hit, that brings the total to, 66,992,425.