A fog bow is a rainbow's pale cousin. The optics are the same, light refracted and reflected back out of suspended water droplets, but fog droplets are so much smaller than raindrops that diffraction smears the colours together, and what you get is a broad white arc with at most a faint red blush on the outside and a bluish tinge within. They are not rare, exactly, but they require the sun behind you, fog in front of you, and thin enough fog for sunlight to penetrate. All three at once is the uncommon part.
Getting ashore that morning was a wet landing: the ship anchors offshore, everyone goes in by zodiac, and you step off the boat into ankle-deep water, which is why we carried hiking boots and wore rubber boots and waterproof trousers for the transfer. It is an undignified process and an efficient one, and it is how you reach most of the Arctic coast.
Fun fact: because fog bows are formed by such small droplets they are also called white rainbows or cloud bows, and pilots see them regularly from above, arcing across the tops of cloud layers with the aircraft's shadow at the centre.
On printing this one: a fog bow is a very low-contrast arc against a very low-contrast sky, and it is genuinely fragile in reproduction. Print it badly and the bow simply is not there. This is the image in the gallery I would most insist on seeing done properly. Metal, and do not go small.