Your current task: Find Slade
So - the plan failed again and you are again stuck in the caves. But hey - you've got a flamethrower. Your patch is pretty linear, so you shouldn't get lost.
On your way you will encounter craters blowing flammable gas. It's suitable for destroying enemies and rocks.
You shouldn't get run out of ammo, there are plenty of well supplied bodies. But remember - most of the fights you are able to avoid.
Slade is waiting for you in the underground lake chamber. Along with the another boss.
Your current task: Kill the beast
Well - it's a tough beast. When it's tentacles are submerged - it will try to bite you. So there you have - use one the "gas shafts" to detonate when it is attacking. That is the key. Then dodge his attacks and repeat presented tactics.
Your current task: Follow Slade
Turok would return Slade his weapon. Use the newly constructed bridge and move along.
Your current task: Get to the surface
There are tens of bugs waiting for you, fortunately the rocket also waits for you along with some explosive gas craters on you way. Fighting bugs should be a pure fun now.
When you spot a soldier fighting with a giant scorpion - you are close to the exit. Get Pulse Rifle - it will come in handy when fighting MG troops.
In next room - there are bugs on the bottom and MG soldiers on the top side - as in life - it is better to be on top. First of all - get rid of the sniper and a guy controlling the machinegun nest. All of the ladder leading on top are highlighted, so there would be no problem finding them.
After you finish your battle head to the surface.