Iron Man had a huge budget of $140 million due to its special effects and big name actors like Robert Downey Jr., while Open Water had a very low budget of just $500,000 since it was filmed in the ocean and did not require many effects. Despite its low budget, Open Water made $52.1 million worldwide. Iron Man made over $318 million to recoup its large budget. Both films were produced by major studios - Iron Man by Marvel Studios and Open Water by Lionsgate Entertainment.