The High Seas of Mars: Red Frontier Book 4

The Great Northern Sea of Mars is a bloodbath.When rival syndicates fight for control of the planet's largest ocean, hired gun Jack Taylor and his team of mercenaries are sent to ensure that one side retains ownership of the expanse, no matter the cost. It's an assignment that finds Taylor fighting the worst that Mars has to offer in a territory rife with unbelievable dangers.