Sea King

Sea King is the Cargo ship between Neptune Vasilias and the water from the RWBY fandom.

Canon
We first find out that Neptune is afraid of the water in volume 3. When team sssn fights against team ndgo it is revealed that team sssn has water on their side of the ring. This horrifies Neptune so much to the point where he runs to the enemies side where there is no water. Blake then reveals to the other members in team rwby that Neptune is scared of the water.

The extent to neptune's fear of the water is further exaggerrated in rwby chibi volume 1, chapter 15. Here it is shown that he's even afraid of small puddles, the rain and even showers. Later when Neptune covers for Sun as a life guard at a pool, Jaune falls into said pool and because Neptune pretends not to notice, Jaune ends up drowning. During the fight with team ndgo Neptune is shown to be so petrified of the water that he waits until the last second to help his teammates.

Fanon
Sea King is not a popular Cargo ship in the RWBY Fandom. Though alot of fans began jokingly shipping it due to Neptune being named after the roman god of the sea and yet he's afraid of the water. People also think it's hilarious since he also has a water based semblance. Some people even jokingly ship the two since many people in the beginning didn't like Neptune and his douchy demeanour. It has a small fanbase on tumblr.

Fandom
Tumblr

Trivia

 * the ship name comes from the fact that Neptune is named after the roman god of the sea and the fact that his surname means prince in old greek