The anniversary of the BP Deepwater oil spill in the Gulf of Mexico has come and gone, but many questions remain unanswered, not least who was to blame for what? Now, thanks to Greenpeace, you can play a part in finding some answers.

Greenpeace have been using freedom of information laws to gather as many previously confidential documents as possible. They have now amassed 30,000 pages worth, from sources ranging from the US department of transportation to the office of Louisiana governor Bobby Jindal to the UK's embassies in the US.

The Guardian has already published two stories based on released documents:

• Emails expose BP's attempts to control research into impact of Gulf oil spill

• BP oil spill: British diplomatic damage control efforts revealed

But now Greenpeace needs your help to find out more:

Just like the gusher in the Gulf the trickle [of FOI documents] has become a flood, and now we have around 30,000 pages of memos, reports and even flight records about the worst oil spill in American history. While some of the agencies have simply ignored our requests, others have gotten back with some interesting documents. The problem is we simply don't have time to go through them all. But no one has the manpower to read the fine print. Plus, we're getting more through the letterbox almost every day. This is where you come in. We've created a new site which allows anyone to view, download and comment on these documents. We're updating it with new stuff and categorizing it to make your life easier. Always imagined yourself winning a Pulitzer? Still mad at BP and want to find out what really happened out there? Searching for evidence for a compensation claim? Now is your chance to dig up some gems.

The site, called Greenpeace Polluter Watch, is live now. If you find something, let Greenpeace know, or me.