"EHH?" is what was the basic reaction of the crew, which successfully gotten the attention of the leftover crew members.
While they now realized that what they were seeing was a person, looking more carefully they can see that instead of seaweed, it was hair. The hair was long curly and goes down to the person's hips. Also, that they were also laying on a wooden board so their body wasn't completely in the water. Just by looking at them it is unclear just how long they have been in the water for or what gender they are.
But before anyone could think further on what to do, Luffy stretched his arm and grabbed the person by their hair bring them on board.
"Oi, Luffy what do you think you're doing?" Nami questioned him, but it sounded more like a demand coming from her.
"Eh, what do you mean, Nami? I was saving this person obviously." He said it like its common knowledge to just pick up a body floating in the water, which made a tick mark appeared on Nami's forehead.
"What if this person is dangerous?" She practically shouted.
"They look more dead then dangerous to me." Robin said in a calm and neutral voice, making most of her crew mates look at her weirdly.
While Nami continued to scold Luffy, a small groan came from the new comer. It was soft and almost inaudible, but it was enough to catch everyone's attention. The crew looked at them waiting for any more signs of life, but all they got were stillness and quiet. Seconds passed, but it felt like minutes just staring at this person, until they finally moved. Not much just a twitch of their hand, and that's all it took for Chopper to be by their side in seconds. No one spoke, just watched as Chopper checked the person's pulse and breathing first.
"Her breathing is shallow as well as her pulse; also I noticed that there is a gash in her forehead. It's not very deep, but enough to cause head trauma." He stated more to himself then to the others. Chopper then shifted into his heavyweight point and carried her into the gallery.