There were 16
The Titanic possessed 15 bulkheads, which divided the ship into 16 watertight compartments. The Titanic was designed to still stay afloat even if 4 compartments were breached, but upon impact 5 of them were breached, and eventually they all flooded as the ship sank.
16. only 4 could be fully full until the shiip sank. 6 were full.
It had 4
6 watertight compartments
The Titanic was called unsinkable because it was believed to have advanced safety features, such as watertight compartments and a double hull, that would prevent it from sinking if it hit an iceberg.
People thought the titanic was 'unsinkable' because the ship had a double bottomed hull that was divided into 16 presumably watertight compartments. Four of these could be flooded without endangering the liner's bouyancy, so the titanic was considered unsinkable. When the ship collided with the iceberg however, five of the compartments flooded, and the boat couldn't hold the weight of the flooded hull (body of the boat), and this made it heavier and more likely to sink.
16
16
Titanic was fairly believed to be unsinkable because of many safety-features - which could have protected her under normal circumstances. These include watertight doors and a double-hull.
The Titanic can stay afloat if four of the watertight compartments were flooded. Unfortunately, five of those compartments were flooded, and the ocean water was spilling over each compartment, accelerating her sinking.
The Titanic was thought to be unsinkable because it boasted many luxuries largely unknown at the time, including a double hull, "watertight" compartments and fast engines. In addition, the sheer size of the ship was intimidating, which probably contributed to the assumption that it was unsinkable.
3