How many letters does the top answer for “navigable deep diving vessel for underwater exploration” have?

The most common answer is bathyscaph (10 letters).

Crossword clue: navigable deep diving vessel for underwater exploration

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

bathyscaph 10 letters wn-def

navigable deep diving vessel for underwater exploration

bathyscaphe 11 letters wn-def

navigable deep diving vessel for underwater exploration