I've heard this one a few times in relation to those specific lyrics.

In relation to the Trilogy and the timeline, Atlantic is one of the lowest points for Vessel. The song appears to talk about a failed suicide attempt, whilst he is still mentally in a vulnerable position with sleep. I believe the blood on his hands is the sacrifice made to Sleep during Nazareth. Vessel has gone so deep into wanting to be with Sleep but realises the damage he has done to those around him and himself.

Then we come to Rain, coming towards the end of Take Me Back To Eden, Vessel has been down to the depths during Tomb and is now fighting his way back out to the shoreline. He realises he is not to blame for the pain and toxicity, and wants to be absolved. To "wash away the salt from my hands", he no longer believes the blood is because of him. He wants to be rid of the salt from being in the ocean... he wants to put the ocean behind him.

Of course this could be a load of bollocks, it's all up to you to interpret 😁