They try to get Blake and Weiss's attention

"Yang!" Ruby cried out, "What the heck are we going to do?"

"Don't worry sis, I've got a plan" said Yang, calmly.

Yang swam closer to the shore and beckoned Ruby to follow her.

"Just make sure you keep your boobs below the water!" Yang instructed her sister, who nodded.

They swam to the shallowest point of the sea at which Yang, the taller of the two, could still stand up and have her boobs covered by the waves.

"BLAKE!" shouted Yang, "BLAKE WE NEED YOUR HELP!"

Blake could not hear her, and simply carried on reading her book.

"It's no good, Ruby, she's not responding."

"Why don't we just wave our arms to get their attention?"

"Because," Yang began, her eyes turning red, "there's a lifeguard over there who might think we are drowning and will come and find us naked!"

"Oh yeah... so what are we going to do?"

"You are shorter than me, you can go closer without them seeing your boobs, so you are going to have to walk closer and try again."

"Oh no, are you serious?" asked an incredibly anxious Ruby, "Is there really no other way?"

"It's either this or we wave our arms and risk the lifeguard seeing us," said Yang calmly, having resigned herself to the situation, "your choice."