What type of tube would be most suitable for opening up a curved pipe?

A flexible tube would be the most suitable choice for opening up a curved pipe. When working with a curved pipe, it is essential to use a tube that can easily adjust to the bends and curves of the pipe. A flexible tube offers the necessary adaptability to match the shape of the pipe, allowing for effective manipulation. In contrast, solid and rigid tubes lack the flexibility needed to navigate curved pipes, making them unsuitable for this task. Perforated tubes, which have holes, are not relevant in this scenario where the focus is on the tube's ability to conform to the shape of the curved pipe.