Chester zoo state that they never have chained their elephants. Do they mean when the elephant is in labour or never chained at all? If they mean the latter I would suggest that this statement is incorrect, as dear old Sheba is seen on the television series made at the zoo chained while having her health check, please note that this is an observation not a criticism as I appreciate keepers safety has to be considered, good wishes to Thi, hope everything goes well for her and the baby.