Which undersea summons are worthwhile?

[Jazzepi]

Lingchih said:
Underwater Combat 101:

1) You must have Shark Attack. Beeline toward it. It is your early Atom Bomb.

2) Summon Asp Turtle. Oh my... yes, summon some Asp Turtles. They are extremely nasty.

3) Summon Water Queens. They regenerate all hit points each turn. Equip them well.

I would avoid fighting an undersea battle without both shark attack and friendly currents cast. You can get a trident from construction 4, I think, that casts currents each battle for free. You'll have to cast shark attack, but it's well worth it.

Jazzepi