lol, any boat will crash and sink if you poke a hole in it.
It would take much more than a hole to sink Titanic II. Said hole poker would need to get past her state-of-the-art sonar and radar, and be unnoticed by any second-hand source in range of her satellite communication system. Furthermore, Titanic II has what appears to be more watertight compartments than Titanic had, and even a watertight deck to divide those existing compartments into smaller sizes. What's more, she has a lifeboat capacity of well over 6,000 (the eighteen modern lifeboats of 250 people each, plus the eight modern life rafts which I read from a second-hand source can hold a total of 800 people between them, plus the historical lifeboats which Deltamarin, the designers of the ship, say will be seaworthy enough to act as tenders for harbor excursions), while her additional design and technological features will ensure that even if she does sink, she will take as long as possible to do so.
All in all, I can't even conceive of any realistic threat which could sink the Titanic II (including icebergs because those things have been tracked by the International Ice Patrol ever since the year after Titanic sank, and the IIP boasts having not had a single ship listening to them ever strike ice), and even beyond that sink the ship in a way that would lead to a significant loss of life.