Pick a wreck, there are plenty.
Underwater Sites - ProjectEleuthera.org
Those objetcs should have already been in water. Have someone put them is water for you if at all possible.
2 Shipwrecks
2.1 The Devil's Backbone
2.1.1 USS Boston (Devil's Backbone, 1846)
2.1.2 Carnarvon (Devil's Backbone, 1916)
2.1.3 Cienfuegos (Devil's Backbone, 1895)
2.1.4 Farmer (Devil's Backbone, 1842)
2.1.5 Train Wreck (Devil's Backbone, 1865)
2.1.6 Vanaheim (Devil's Backbone, 1969)
2.1.7 William (Devil's Backbone, 1648)
2.2 Egg Island Area
2.2.1 Adele Ball (Spanish Wells or Harbour Island, 1899)
2.2.2 Arimoroa (Egg Island, 1970)
2.2.3 Arthur McArdle (Egg Island Reef, 1904)
2.2.4 Francis Stanton (Russell Island, 1844)
2.2.5 Margaret M. Ford (Egg Island Reef, 1916)
2.2.6 Robert (Egg Island, 1816)
2.2.7 Santa Rosa (Egg Island, 1821)
2.2.8 Stephen Phillips (Egg Island Reef, 1842)
2.2.9 Surprise (Southwest Reef between Egg Island and Current Rock, 1994)
2.2.10 Two Sisters (Royal Island, 1791)
2.3 James Point
2.3.1 Atlantic Pearl (James Point, 1979)
2.3.2 Barge 264 (Floated then scuttled, 1999)
2.3.3 SS Blenheim (James Point, 1882)
2.3.4 Gangmar (James Point, 1977)
2.3.5 General Colocotronis (Floated then scuttled, 1968)
2.3.6 USS LST 291 (Salvaged, 1954)
2.3.7 Neptune (James Point, 1818)
2.4 Miscellaneous
2.4.1 Advance (North Eleuthera, 1914)
2.4.2 Baltic (Eleuthera, 1866)
2.4.3 Bernardo (Eleuthera, 1943)
2.4.4 Birmingham (Ellison's Reef, Harbour Island, 1843)
2.4.5 Commerce (Harbour Island, 1846)
2.4.6 Conck (Unknown, 1813)
2.4.7 Eolus (Unknown, 1824)
2.4.8 Fame (Harbour Island, 1817)
2.4.9 J. P. Ellicott (Eleuthera, 1866)
2.4.10 John Hale (North Eleuthera, 1843)
2.4.11 John R. Plater (Eleuthera, 1866)
2.4.12 Jonathan Knight (Atlantic side off Banks Road, early 1900's)
2.4.13 The Live Oak (Harbour Island, 1824)
2.4.14 Margaret and Jessie (Eleuthera, 1863)
2.4.15 Ocean Maid (Wreck Point, 1940's)
2.4.16 Rinaldo (Unknown, 1841)
2.4.17 Saga (Atlantic side, south of the Glass Window, 1960's)
2.4.18 Swallow (North Eleuthera, 1816)
2.4.19 Unknown American brigantine (Unknown, 1702)
2.4.20 Yungay (Unknown, 1928)
2.4.21 Zelma Rose/Unknown wreck (Six Schilling Cay, 1952)
3 Cenotes (a.k.a. Ocean Holes or Blue Holes)
3.1 Ocean Hole (Rock Sound)
3.2 Boiling Hole (Rock Sound)
3.3 Ocean Hole (James Cistern)
3.4 Fisher's Pond (Gregory Town)