First Marine Submersible to Be Used in Combat
Puzzle 9 of Tricky Spelling Pack
Question is: First Marine Submersible to Be Used in Combat
and the answer is: TURTLE
Word Meaning:
TURTLE — (zoology, US, Canada) Any land, marine, or semi-aquatic reptile of the order Testudines, characterised by a protective shell enclosing its body. See also tortoise.
Definitions from Wiktionary.