Heat 3 tablespoons oil in a large pot over medium heat.
Add onion and fennel; saut 5 minutes or until tender.
Add minced garlic, thyme, and red pepper; saut 1 minute. Stir in tomato paste; cook 1 minute.
Add wine, cook on high 5 minutes or until reduced by half.
Add tomatoes with juices, clam juice, water, 1/2 teaspoon salt, and 1/4 teaspoon pepper. Boil; reduce heat to low, and simmer, partially covered, 10 minutes.
Preheat oven to 30
Raise heat on stove to medium; add clams. Cover; cook 58 minutes or until shells are just opened.
Remove clams (discard unopened shells). Set aside; keep warm. Lower heat to simmer. Season halibut with remaining 1/4 teaspoon salt and 1/4 teaspoon pepper; add to pot with basil. Cover; cook 2 minutes. Turn off heat, and stir in shrimp and scallops; cover.
Let sit 68 minutes or until shrimp and scallops are just cooked. Return clams to pot; cover.
Arrange bread on a baking sheet.
Drizzle with remaining 12 tablespoons oil; bake 1215 minutes or until golden. Rub smashed garlic onto each slice.