Why don't cruise ships tip over?

Answer: Low center of gravity design

Low center of gravity design ✓ — Correct! Cruise ships are designed with a low center of gravity—the heaviest components (engines, fuel tanks, water, cargo) are positioned low in the hull, below the waterline. When the ship tilts, this low center of gravity creates a righting moment (force rotating it back upright). It's like a weighted-bottom toy that always rights itself. The hull shape also provides buoyancy that opposes tipping.

Water pressure keeps them stable — Wrong. Water pressure doesn't prevent tipping—it acts equally on all sides. Stability comes from the ship's low center of gravity (heavy parts low in the hull) and hull shape. When tilted, the submerged hull shape on the lower side provides more buoyancy, creating an upward force that helps right the ship, but the primary factor is the low center of gravity pulling the ship back upright.

They have underwater anchors — Wrong. Ships don't use underwater anchors for stability while cruising (anchors are only deployed when stopped). Stability comes from physics and design: low center of gravity (heavy engines/fuel/water low in hull) creates a righting moment when the ship tilts, and the hull shape provides buoyancy that opposes tipping. These passive design features keep ships stable without active systems.