[2026] PTE Academic Listening - Fill in the Blanks (Type In)

The deep ocean remains one of the least explored regions on our planet, containing vast stretches of uncharted territory. To reach these extreme depths, engineers must design specialized capable of withstanding immense water pressure. These vessels are often equipped with high-resolution cameras and robotic arms to collect biological from the seafloor. Scientists have discovered unique ecosystems around hydrothermal vents, where life thrives without any . Instead of photosynthesis, these organisms rely on a process called to generate energy from minerals. Exploring these hostile provides critical insights into the origins of life and the potential for life on other planets. However, the high cost and technical complexity of these continue to limit the frequency of deep-sea voyages.