The Deep Sea Proposal
Take your fiance-to-be on a romantic island trip. While you're there, convince them to go scuba diving. Location is key here, so pick a spot underwater that is scenic as well as simple enough to pop the question. Since your partner can't hear you underwater, try holding a water-proof sign with the question on it. Or, just simply get down on bended knee and hold the ring up for your partner to see.
If the whole romantic scuba diving idea isn't in your budget right now, you can also keep the underwater theme alive at home. Take your partner to your favorite aquarium and arrange for a scuba diver to dive in the fish tank holding a '
Will You Marry Me?' sign visible for your partner to see.
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