It's SkyLand 1.
The players spawn in the water and have to swim for the shore, where they find a pulse gun. The entire island is incredibly plain looking and covered with respawning Krall, tough Skaarj scouts, and Skaarj assassins which move at incredible speed, much faster than a pulse projectile. A simple roll takes them about a third-way along the beach. Past this are several titans and queens.
Inside is a dark cave, with a titan guarding a room at the top. As soon as you enter the room it becomes your next spawnpoint, making you respawn in there even though it's full of Skaarj with flak cannons and mercenaries. Fully charged bio glops also rain from the ceiling, spawnkilling you.
Up past the flak tentacles is a darkened room with a tough mini-titan
Next up is an underwater area full of fish, squid, and slith that shoot razor blades. It's also so dark you need a searchlight.
Armed with the short-range flak cannons from the last spawnpoint, pulse guns not being given again, the players emerge into a wide open area filled with Skaarj soldiers. As you can see, one of them also has an instagib rifle.
This "Kichagai!" is the bossmonster, he has plenty of health and enjoys gibbing the players as they swim upwards through the pool. You're then subjected to a run of about a minute to get back to the action, whereupon you are instagibbed and get to do it again.
Then there's the map end on an altar inside a hill. I'm not sure if the map deserves deleting or not, but in my opinion it's pretty bad.
