Alternative fuels, advanced technology, and futuristic creations have long been the focus of concept yachts. In 2024, designers pushed the envelope with hybrid vessels—both in terms of propulsion and function—and penned ever-imaginative concepts that address sustainability, quality of life on board, and brave new ideas.

Our choices for this year feature bold imaginative details and creative use cases, but they are also within the bounds of reality (well, most of them) by yacht designers with one foot in reality. We look at electric-powered yachts that recharge batteries while under way, a yacht concept that is more of a resort, and several underwater yachts offering exceptional views of marine life.

One prime example is the Migaloo M5, a “hybrid” yacht concepts that doubles as a submersible. Migaloo PSY’s design is not only cool-looking but bold: The 545-foot behemoth is intended to function underwater for up to four weeks, and includes a spa, outdoor cinema, helipad, and two “mini-me” subs. If nothing else, it illustrates how nothing is off the table when it comes to superyacht concepts.

Here are 13 of the wildest yacht concepts to hail from design boards in 2024.