Why can't we get to the mantle?

Why is it that we, as human beings, seemingly cannot reach the mantle of the Earth? It's an intriguing mystery that has perplexed many minds throughout the ages. Could it be due to the extreme temperatures and pressures that exist deep within our planet's interior? Or is it the technological limitations we currently face that prevent us from exploring such depths? Perhaps the mantle holds secrets that we are not yet ready to unlock. But why, exactly, can't we get to the mantle? What obstacles lie in our path, and what might be the potential benefits of overcoming them?