The crew is presumably strong because their captain is one of the Eleven Supernovas and a former Rear Admiral, which is the fourth highest position in the Marines. Another suggestion that the crew is strong is the fact that they made it all the way to the Sabaody Archipelago, despite them being a "rookie" crew. They were also skilled enough to escape Kizaru's capture during his raid on the island while their captain was taken down by the admiral. Also, their captain is not afraid to challenge a subordinate of Kaido, despite Kaido being one of the Yonko, in an attempt to show his strength.
The crew's ship, the Liberal Hind (リベラルハインド号,Riberaru Haindo-gō?), is a slightly modified Marine battleship with inverted colors, possibly Drake's original ship when he was a Marine. It can also be implied that as a former Marine ship, it holds and retains the same features and advantages that most Marine ships would have. Their ship has been coated with the Yarukiman resin, allowing it to submerge underwater by reducing its buoyancy, and withstanding the water pressure of 10,000 meters.
The crew arrived at Sabaody Archipelago, around the same time as many of the other rookie crews. Soon after, X Drake breaks up a fight between Urouge and Killer, stating that if they wanted to fight, they should save it for the New World.