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Cover
Jan. 26, 2026
Document Type 8-K
Amendment Flag false
Document Period End Date Jan. 26, 2026
Entity File Number 001-42692
Entity Registrant Name Blue Water Acquisition Corp. III
Entity Central Index Key 0002050501
Entity Tax Identification Number 33-2301550
Entity Incorporation, State or Country Code E9
Entity Address, Address Line One 1012 Springfield Avenue
Entity Address, City or Town Mountainside
Entity Address, State or Province NJ
Entity Address, Postal Zip Code 07092
City Area Code 201
Local Phone Number 985-8300
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false
Units, each consisting of one Class A ordinary share, par value $0.0001 per share, and one-half of one redeemable warrant  
Title of 12(b) Security Units, each consisting of one Class A ordinary share, par value $0.0001 per share, and one-half of one redeemable warrant
Trading Symbol BLUWU
Security Exchange Name NASDAQ
Class A ordinary shares, par value $0.0001 per share  
Title of 12(b) Security Class A ordinary shares, par value $0.0001 per share
Trading Symbol BLUW
Security Exchange Name NASDAQ
Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share  
Title of 12(b) Security Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share
Trading Symbol BLUWW
Security Exchange Name NASDAQ