AI CONCISE SUMMARY: Researchers have discovered a new virus called vB_HmeY_H4907, which infects bacteria living in the Mariana Trench at 8,900 meters deep. The virus has an icosahedron-shaped head and tail used to identify and penetrate its target. This discovery adds to the enormous diversity of viruses thought to exist in this extreme environment. Viruses like these play a crucial role in marine ecosystems by killing microbes and releasing organic matter rich in nitrogen, phosphorus, and carbon. The study provides a foundation for researchers to learn more about the life strategies and ecology of viruses in extreme environments.