viince wrote:

It might be because you put it in the oven too early. Because it's so
big, you might need to bench proov it longer. I usually get this
problem with my ciabattas (one huge bubble in the middle) When I load
them underprooved, in a too hot oven, or not enough steam in the
oven.)
Viince,

I thought you are working in a bakery, so why does not your boss help you
make better bread?

Joe Umstead