If you have gm fishing...which you can easily get afk...you can go out on a boat into deepwater and fish up the occasional sea serpent. The sea serpents either have a treasure map(junk ones), fishing net, or message in a bottle. You click on the bottle and out pops a message. You click on that and it gives you coordinates for a treasure chest. This is where it gets tricky, since it may be on the other side of the world. I will usually just automap the location and put in a boat at the nearest land to go get the treasure. Anyway, you go to the treasure location and start fishing. You will pull out shipwreck items and eventually you pull out a chest. They usually have pretty good loot. I've had some with multiple vanqs and invulnerability items in them. There is also a fishing net in each one...I've only gotten green...but I assume that's probably where people get the nifty colored nets. I've also been lucky enough to fish up another sea serpent with another mib while trying to get my chest....very convenient. lol