Why did the titanic sink?

It was never actually watertight it had holes at the top of it's compartment. The engineer was at fault because he portrayed it as unsinkable, it was the radio officer's fault because he received 3 messages about ice but ignored them, it was the captains fault because although he tried to avoid the iceberg by going slow and to the side, this is what was the fatal moment. If it had crashed head on, then it would have in fact not sunk and the design would have worked. Yes it was a 'blackberg', an ceberg that appears black in the water.