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The Tuvalu class was the first of the BORON
designs not to be directly derived from the
Freemantle class. It was conceived as a "double
Freemantle", each vessel having at least twice the
capability of the smaller ships. The design was not
deemed a great success, as the problems involved in
having two modules on one ship caused the programme
cost to blow out alarmingly, and their expense is
very high - comparable to more conventional
designs.
Production was soon switched to the Block II
design, which traded in the ability to carry two
modules for a greatly increased structural
strength. Recently, however, the Block I Tuvalu has
been reinstated in production, the resultant ships
usually carrying two different types of pod, one
military, one not, so they become self-escorting
troop transports, self-escorting cargo carriers and
so on.
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