Hello,
in the old adventure "The tempest" the player characters are advised to use a ritual spell named "Incantation of Summoning the Vessel to Sail Again". There is no description for this ritual and now I ask myself if it is possible to exact it with the rules of the 5th edition.
The spell is able to raise a wreck (over sixty feet long, with a mast of about thirty feet) from the bottom of the sea. The group knows the location of the wreck (more or less), but is not able to see it.
The spell is taught by an old mercurian magus, so perhaps it does not fit completely in the frame of hermetic magic. The story says, that in days of old mercurian magi used this ritual to loot formerly destroyed enemy-vessels.
In my eyes, the ritual could be a Rego Aquam spell, that creates a current, able to lift things from the bottom of the sea to the surface. That would be a Level 4 Guideline. The target could be Part, because only a part of the ocean would be needed to control. The base Part of water is two paces deep, the wooden hull is "over hundred feet down", so you would have to add 2 magnitudes for the increasing size. The Duration could be diameter or concentration, the adventure says it lasts a few moments until you see the shadow of the raising ship, then it takes a minute before the wreck reaches the surface. Because you do not enchant the wreck but a part of the ocean, the range could be touch, but if you want to avoid the dangers of the swirling waters, you could be pleased by a safety distance, so lets take a distance of sight.
So the spell would be Base 4, +3 Sight, +1 Conc, +1 Part, +2 Size = Lvl 35 and has no need to be a ritual any more.
The name of the spell sounds as the magic would be responsible for restoring the vessel to seaworthiness but the adventuretext states, that "suspension in the cold water kept the vessel largely intact - there are no apparent holes in the hull and the keel looks strong". Later "the longship bobs in the water". Of course the sails are gone, but at least the summoned vessel is able to be oared. I think, it is enough to make allowance for the rising-from-the-bottom-of-the-sea-procedure.
What do you think?
Chiarina.