Looking back, although it may have originally been stated that the intention was to breed in the pool (hence the off show birthing pool), what probably happened is after or maybe before it was opened CZ may have been told they could not house a breeding male because of the tunnel, so just housed the current (at the time) male and 2 females then went on the safe side instead getting 5 young females when the previous died. It seems likely that now if they ever breed it will be through A.I. However, although sealions normally live for about 25 years and Colchester's are approaching that, they might not pass for a while anyway, maybe A.I could be used if a couple of the current females die.