Adventurer: Simulator Problem

I’m standing, naked, on a largish flat rock at the edge of an ocean, judging from the salt water smell. I find myself surrounded by six large, powerful looking males, each as naked as I am. They’re perhaps seven feet tall with slate gray skin. They’re heavily muscled, to the extent that they look like bodybuilders. I’m not a doctor, but there are just enough differences in skeletal structure and musculature that I’m certain that they’re not men, but aliens. Each alien has a club. The aliens don’t seem at all friendly.
I turn my back to the ocean and advance upon the aliens standing around the rock on which I stand. I howl a challenge at the aliens as I move.
The aliens move toward me. At least the aliens in front of me and to either side move toward me.
I have to assume that the couple of aliens still behind me also move toward me. The assumption is my only chance. I suddenly whirl and jump to the edge of the rock nearest the ocean. Luck is with me and an alien is attempting to climb up onto the rock I’m standing on. I kick the alien in the face hard and then use his sprawled body as a sort of barrier against a remaining alien on the ocean side of the rock as I leap from the rock to the sand, scoop up the club that face kick alien dropped and then I dive into the ocean. The ocean that I dive into seems the same as an ocean back on Earth. Diving into an unknown ocean could have killed me. However, the large, powerful aliens certainly would have killed me, unless I jumped.
There’s no way that I can fight six large, powerful aliens at once, hand to hand and win. However, from the looks of them, they’ll be too muscular to be very good as swimmers. (Fat floats, bone and muscle sink. The aliens appear to be mostly bone and muscle.) I swim under water and straight out from the beach. I’m hampered a bit by having to carry the club I picked up, but any pursuer will probably be similarly hampered. I finally run out of air and I flip on my back and surface.
One of the aliens has pursued me, wading into the water until he’s up to his neck. He doesn’t try to swim after me, but waves his club and glares at me in very unfriendly fashion.
I glare back and hyperventilate for a bit. I then flip dive and head back toward large and unfriendly. I stay deep and get back to him after a bit of swimming, using pretty much leg kicks only, since I’m still carrying the club I obtained from face kick alien.
Large and unfriendly tries to hit me with his club. The guy might have the strength of a gorilla, but there’s no way he’s going to damage me with a club, as deep as I am. The club thuds on the surface of the water but it doesn’t even get as deep as I am.