What we used in the tub (and we weren't kids) was the little boat (like beach fun, from ages ago) and the first submarine... I don't think we ever used anything else... Certainly not a big ship.
Ok, all our earlier klickys, when we WERE kids, were quite used to the tub. There were diving championships and all. Adama, our blonde indian chief (he came like that in the box - that styrofoam 7 guys+4 horses one.. in 1983) was the undisputed champion. I remember that.