The correct option, "2 and 3 only," is accurate because Matsya-6000 is specifically designed to carry three people for deep-sea exploration, aligning with India's objective to explore and utilize ocean resources. Additionally, Samudrayaan is indeed a key project under the Deep Ocean Mission, aimed at developing technologies for deep-sea exploration and research. However, the mission is actually managed by the Ministry of Earth Sciences, not the Ministry of Ports, Shipping and Waterways, which makes statement 1 incorrect. This distinction highlights the collaborative nature of India's scientific endeavors in marine exploration and resource management as outlined in UPSC-level resources.