Bring a large pot of water to boil and cook pasta according to package directions. Drain.
Heat oil in a skillet over medium heat. Add in onions and garlic. Cook just until the onions soften, about 2 minutes. Be careful not to burn the garlic. Add in the clams and wine. Cover and cook for 5 minutes. Add in the shrimp cover and cook for 3 - 5 more minutes or until the clams have opened and the prawns are cooked through. Add linguine to the pot and toss to combine. Serve.