Ship going around Caribbean island gets self-contained underwater breathing apparatuses (6)

I believe the answer is:

scubas

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'breathing apparatuses' is the definition.
(scuba is a kind of breathing apparatus)

'ship going around caribbean island' is the wordplay.
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'going around' indicates putting letters inside.
'caribbean island' becomes 'cuba' (I've seen this in another clue).
'ss' enclosing 'cuba' is 'SCUBAS'.

'gets self-contained underwater' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

I've seen this clue in The Hindu.

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