I cannot overstate my contempt for this product - my daughter saved for many weeks to buy this with her pocket money (with a little help from the grandparents). Basically, it's a total rip-off.
The 2 octonauts (Barnacles & Kwazi - no Peso), who barely fit in the octopod are "complimented" by 4 rubbish sea creatures, some stupid attachments that dangle pointlessly from the octopod and an undersize Gup.
I can't comment on the other octonaut toys, but as far as this one goes; forty quid? Really? It would be expensive at half the price - save your money and steer well clear of this crass piece of overpriced, commercialised dross.