The Philippines is acquiring new patrol boats and perhaps submarines (in future) to defend several territorial claims. This includes claims in the South China Seas - called "West Philippine Sea" in the Philippines (Map courtesy Wall Street Journal via Chinh's news)
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Korea may possibly be a submarine seller and could use the opportunity to build alliance relations with the Philippines.
Too expensive? To maintain parity with such neighbours as Malaysia and Indonesia the Philippines would need two or three middle sized subs - perhaps the South Korean made Chang Bogo class ? But the Chang Bogo costs $500+ million apiece.
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Too small? Too old? South Korea has two Dolgorae class mini submarines (above) launched 1990 and 1991, 175 tons, with two small 410mm torpedo tubes. They have crews of 14 and may be used for surveillance and perhaps special forces. They were bought by South Korea in the 1980s to accustom its Navy to submarine operations.
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Just right? In 2011 South Korea indicated it would be building new subs to replace the Dolgoraes. These are known as KSS-500As. Specifications 510 tons, 37m long, 4.5m wide, diving depth 250m, max speed 20 kn, cruise speed 7 kn, endurance 3 weeks, range up to 2,000 miles, crew of 10. Propulsion Lithium-ion batteries (LIBs) charged at wharf or LIBs and diesel engines. If South Korea also wants 500As for its own Navy this may reduce any development cost burden.
BACKGROUND
The Philippines is becoming sufficiently concerned about maritime territorial disputes (eg. in the South China Sea, known as the "West Philippine Sea" in the Philippines) that it is seeking new vessels and aircraft. Japan is seeking stronger bilateral relations with key countries in the region, including the Philippines:
- Japan is selling (or planning to sell?) the Philippine Coast Guard 10 patrol boats (44m long) with a loan of ¥19 billion ($150 million total) from Tokyo based Japan Marine United
- Japan may also be offering (used?) P-3C Orion patrol aircraft built by Japan's KHI
Japan became an expert mini-sub user/builder in World War Two (even attacking a ferry boat in Sydney Harbour) but I don't know of any current Japanese plans to build modern mini-subs.
Philippines ABS-CBNnews.com reported May 27, 2015 http://www.abs-cbnnews.com/nation/05/27/15/philippine-navy-eyes-submarines-deterrence :
"Philippine Navy eyes submarines for 'deterrence'
MANILA - The Philippine Navy said acquiring submarines is part of the plan to modernize the military, but admitted it won't be easy and can’t happen overnight.
Nonetheless, an office to handle the development of submarine capability has been put up, said Navy chief Vice Admiral Jesus Millan.
“What we are pursuing of course is to take the initiative. The first important thing is to acknowledge the importance of such capability for our future requirements,” he said.
He said the office can help the military gain knowledge of a new defense capability.
“That is why, our initial step in the Navy is to establish an office to start learning about this discipline. It’s important that we learn about it and prepare our troops who will be involved in the development of such capability,” said Millan.
Navy vice commander Rear Adm. Caesar Taccad said in December [2014] that the submarines can be used as “deterrence.”
The Philippines is embroiled in a dispute with several nations over ownership of the potentially oil-rich West Philippine Sea. China is aggressively pursuing its claim via reclamation in several islands and reefs within the area.
Taccad had said the submarines will serve as a deterrent “so other countries will not try to interfere with our [peaceful] exercise of sovereignty over our maritime areas.”
Millan said the submarines, “can bring a lot of help to us. As you can see, there are instances that it can perform non-traditional roles, even in search and rescue or in doing things that are beyond the capabilities of surface assets. These things can help us.”" ENDS
Pete