What is this in soft shelled egg?

[my beautiful girls]

Is this membrane or worm or .....can anyone tell me? Second soft shell egg she has laid in 2 days. Thank you in advance.

 

[MysteryChicken]

Is this membrane or worm or .....can anyone tell me? Second soft shell egg she has laid in 2 days. Thank you in advance.

Thick chalaza.

 

[my beautiful girls]

Thick chalaza.

Thank you. That puts my mind a rest. So much to know!