Narran is RS gold going to have an agility course that's just like the Brimhaven one anyhow more difficult, the tickets you obtain out of it can be exchanged for a mogre suit which increases your chance at agility, an ultra version which does increases luck in agility better along with a supreme version which does the very best in upping your fortune in agility and Yun'lar will have a mini-game in which you kill eachother for tickets but the person who gets murdered the least gets experience in defence and tickets for mogre armor.

Once you have completed Deep Sea Troubles you could talk to Gompar for another one known as Shipwreck. Gompar will inform you a boat has sunk when it crashed into the walls of Mogrin. He'll want you to fix the wall. Go up to Captain Murk and tell him to sail closer to the wallsocket. He'll do so. You can then dive.

You will still be at the surface of the sea. To fix the wall, you have to have a hammer, 23 Gomrock Bars (can be bought at Mogrin in any area or mined outside with 43 mining and smelted in an underwater vent, not a furnace, with level 51 smithing) and level 37 construction. Fix the wall. Return around Captain Murk and tell him to sail a bit further away so that you can dive. He'll do that. Proceed to the palace (can be entered through some area ) and talk to Gompar.

Tell Gompar you mended the wall. He'll thank you and supply you 16,000 gp. Tell him you think the boat belonged to a priest who was sailing this manner. He will say that he watched a couple human beings float to a nearby cave at a water cliff but it caved in because of a small earthquake. Go to the cave and mine the rocks blocking it (requires 43 mining.) Go inside the cave and it'll be dry in there since the water buy OSRS fire cape  can't reach far enough to flood it.