We made this card at craft club yesterday.
The sentiment stamps are Waltzingmouse and the shell stamps (just about visible, we stamped in Versamark) are by Hero Arts
We attached the navy card to the card-blank just using masking tape and cut a hole through both using a circle Nestie die. Then we removed the navy card, did the stamping and heat embossing, and then adhered a small piece of acetate over the hole.
The navy card was then fixed to the card-blank, the same circle die plus one two sizes bigger used to cut silver card to make the porthole.
The gems were a last-minute decision, we didn't want to make it too fussy but decided the gems looked like rivets
The anchor is a Memory Box die and this was glued to the inside of the card.
Some more stamping of the Hero Arts shells to finish.