Richard Matthews speaks with Engebret Dahm, CEO of Klaveness Combination Carriers, about the rise, fall, and resurgence of tanker/dry-bulk “two-in-one” vessels. Once prominent between the 1970s and 1990s, these ships declined due to stricter safety and vetting standards following major incidents, cargo history limitations, higher complexity and capital costs, and poor economics in an era of low fuel prices.

The conversation also covers operational complexities such as cargo switching and tank cleaning, early resistance from oil majors, and the broader, more diversified customer base seen today. Dahm highlights the high barriers to entry—from vessel design to crew expertise and systems—as well as the role of efficiency in decarbonization, the limitations of current CII metrics, ongoing retrofit investments, alternative fuel flexibility, and the value of extending asset life through strong, customer-backed contracts.