LNG carriers demand exceptional transit protection

Which ships would create the most destructive collision?

Two fully loaded LNG carriers, because their hazardous cargo makes the consequences of a collision exceptionally severe.

Fully loaded LNG carriers are the choice because their cargo makes them exceptional mobile hazards. Their transit demands unusual care and protection, illustrated by an official who blamed every new grey hair on responsibility for LNG traffic through part of the Suez Canal. A later comparison places a collision between two loaded carriers one or perhaps two orders of magnitude above the Halifax Explosion, depending on their cargo loads. This is a qualitative warning rather than an engineering yield calculation.