Not *my* pics but here is an idea of what is going on inside my eggs:
This is a spanish-based site so perhaps Mari can do some translations if she is feeling nice LOL.
My torts are about that size/shape now, but obviously my eggs still have their shells
So far, I've translated this, I'm a bit tired so will translate the rest later :
Due to an accident in the last days of incubation of some indian star tortoise eggs, we could take photos of the activities and behaviour that the tortoise does before leaving the egg.
We can see that in the 2nd images the tortoise is still within the membrane, it is in a state of total lethargy, absorbing nutrients from the delicate veins (probably capilliaries?) that surround the bag. The tortoise remains inactive whilst he stays inside the membrane, which is permeable and permits the exchange of gases from outside.