Great work so far Agent, we have had some more intel, we need to do a bit of research on Blackrock Castle.

Blackrock Castle is a castellated fortification on the banks of the River Lee. Originally developed as a coastal defence fortification but in the 16th century, to protect upper Cork Harbour and port. In 1582 the original fort was built and around 1600, a round tower was constructed to safeguard against pirates. Parts of this structure still remaining today are a circular tower on the water's edge, 10.5m in diameter, but how thick are the walls?

0.5 Meters thick

1.0 Meter Thick

1.2 Meters Thick

1.4 Meters Thick

1.6 Meters Thick

1.8 Meters Thick

2.0 Meters Thick

2.2 Meters Thick

2.4 Meters Thick

2.6 Meters Thick

2.8 Meters Thick