As first described by Chalmers, the hard problem is not unanswerable. He described it as a fairly concrete and specific demand for a physics-like theory of consciousness.
See: Can the hard problem of consciousness, in principle, be answered with a mathematical formula?
Some people have interpreted the hard problem of consciousness as something that physically-based theories of consciousness will forever fail to resolve. They've taken it up as a shield against materialism; they say, "yes, maybe you can say HOW but you can never say WHY!" And what exactly would be the "why" to satisfy such people? Nothing would satisfy them! They will always allude mysteriously to something beyond science.
But Chalmers, who introduced the hard problem of consciousness, did not have that kind of unmeetable standard in mind. Chalmers was actually quite friendly to physically-based theories of consciousness.
Chalmers described the hard problem of consciousness as a problem of finding physics-like mathematical laws that describe the relationship between a physical system and the qualia produced by that system. These laws might be compared to the laws that describe the relationship between a set of moving charges and the electromagnetic forces produced on those charges. They're just formulas we could write on paper; writing those formulas, according to Chalmers, could be a potential solution to the hard problem of consciousness.
Here's a quote from Chalmers about the kind of theory that might qualify as a solution to the hard problem of consciousness:
There is nothing particularly spiritual or mystical about this theory—its overall shape is like that of a physical theory, with a few fundamental entities connected by fundamental laws. It expands the ontology slightly, to be sure, but Maxwell did the same thing. Indeed, the overall structure of this position is entirely naturalistic, allowing that ultimately the universe comes down to a network of basic entities obeying simple laws, and allowing that there may ultimately be a theory of consciousness cast in terms of such laws.