BROWNSVILLE, Texas (AP) — The commercial rocket launches that could begin as early as 2016 in the southernmost tip of Texas will be a critical step toward one day establishing a human presence on Mars, SpaceX founder and CEO Elon Musk said Monday.

With waves from the Gulf of Mexico crashing just over the dunes and crabs skittering around a tent erected for the groundbreaking, Musk said he expects SpaceX to invest $100 million in the world’s first commercial orbital spaceport during the next three to four years.